[web] Repeatedly triggering hot-reload/hot-restart throws errors on the web

when I do hot restart multiple times simultaneouly it give textspan  error or any other error of RenderFlex etc can you fix it fast. Also when I use GetX package it does not hot restart fast It takes too much time and I have to close tab and restart VS code and run flutter run command

Hi @rakeshcoolrex
Can you please provide your flutter doctor -v your flutter run --verbose and a complete reproducible minimal code sample without using third-party packages
For issues related to GetX, please file an issue on their dedicated GitHub
Thank you

My flutter doctor version is[√] Flutter (Channel beta, 1.26.0-17.3., on Microsoft Windows [Version 10.0.19041.746], locale en-IN)
• Flutter version 1.26.0-17.3. at T:\flutter
• Framework revision 4b50ca7f7f (4 days ago), 2021-02-04 19:44:27 -0800
• Engine revision 2c527d6c7e
• Dart version 2.12.0 (build 2.12.0-259.8.beta)
my flutter chrome --verbose
[ +165 ms] executing: [T:\flutter/] git -c log.showSignature=false log -n 1 --pretty=format:%H
[ +127 ms] Exit code 0 from: git -c log.showSignature=false log -n 1 --pretty=format:%H
[   +2 ms] 4b50ca7f7fbf56be72e54cd200825b760416a356
[   +1 ms] executing: [T:\flutter/] git tag --points-at 4b50ca7f7fbf56be72e54cd200825b760416a356
[  +98 ms] Exit code 0 from: git tag --points-at 4b50ca7f7fbf56be72e54cd200825b760416a356
[   +1 ms] 1.26.0-17.3.pre
[  +91 ms] executing: [T:\flutter/] git rev-parse --abbrev-ref --symbolic @{u}
[  +65 ms] Exit code 0 from: git rev-parse --abbrev-ref --symbolic @{u}
[   +1 ms] origin/beta
[   +2 ms] executing: [T:\flutter/] git ls-remote --get-url origin
[ +145 ms] Exit code 0 from: git ls-remote --get-url origin
[   +1 ms] https://github.com/flutter/flutter.git
[ +151 ms] executing: [T:\flutter/] git rev-parse --abbrev-ref HEAD
[  +74 ms] Exit code 0 from: git rev-parse --abbrev-ref HEAD
[   +1 ms] beta
[ +197 ms] Artifact Instance of 'AndroidGenSnapshotArtifacts' is not required, skipping update.
[   +1 ms] Artifact Instance of 'AndroidInternalBuildArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'IOSEngineArtifacts' is not required, skipping update.
[  +27 ms] Artifact Instance of 'FlutterWebSdk' is not required, skipping update.
[   +8 ms] Artifact Instance of 'WindowsEngineArtifacts' is not required, skipping update.
[   +1 ms] Artifact Instance of 'MacOSEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'LinuxEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'LinuxFuchsiaSDKArtifacts' is not required, skipping update.
[   +1 ms] Artifact Instance of 'MacOSFuchsiaSDKArtifacts' is not required, skipping update.
[   +1 ms] Artifact Instance of 'FlutterRunnerSDKArtifacts' is not required, skipping update.
[   +1 ms] Artifact Instance of 'FlutterRunnerDebugSymbols' is not required, skipping update.
[ +220 ms] executing: C:\Users\tony\AppData\Local\Android\sdk\platform-tools\adb.exe devices -l
[ +136 ms] Artifact Instance of 'AndroidGenSnapshotArtifacts' is not required, skipping update.
[   +1 ms] Artifact Instance of 'AndroidInternalBuildArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'IOSEngineArtifacts' is not required, skipping update.
[  +45 ms] Artifact Instance of 'WindowsEngineArtifacts' is not required, skipping update.
[  +28 ms] Artifact Instance of 'MacOSEngineArtifacts' is not required, skipping update.
[   +3 ms] Artifact Instance of 'LinuxEngineArtifacts' is not required, skipping update.
[  +30 ms] Artifact Instance of 'LinuxFuchsiaSDKArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'MacOSFuchsiaSDKArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'FlutterRunnerSDKArtifacts' is not required, skipping update.
[  +25 ms] Artifact Instance of 'FlutterRunnerDebugSymbols' is not required, skipping update.
[ +166 ms] executing: C:\Users\tony\AppData\Local\Android\sdk\platform-tools\adb.exe devices -l
[  +43 ms] Skipping pub get: version match.
[ +280 ms] Generating C:\Users\tony\Desktop\projects\todo2\android\app\src\main\java\io\flutter\plugins\GeneratedPluginRegistrant.java
[ +124 ms] List of devices attached
[ +129 ms] Launching lib\main.dart on Chrome in debug mode...
[  +62 ms] List of devices attached
[ +295 ms] Updating assets
[ +180 ms] Waiting for connection from debug service on Chrome...
[ +192 ms] <- reset
[  +12 ms] T:\flutter\bin\cache\dart-sdk\bin\dart.exe --disable-dart-dev
T:\flutter\bin\cache\artifacts\engine\windows-x64\frontend_server.dart.snapshot --sdk-root T:\flutter\bin\cache\flutter_web_sdk/ --incremental
--target=dartdevc --debugger-module-names --experimental-emit-debug-metadata -DFLUTTER_WEB_AUTO_DETECT=true --output-dill
C:\Users\tony\AppData\Local\Temp\flutter_tools.dcb858fc\flutter_tool.697ae39f\app.dill --libraries-spec
file:///T:/flutter/bin/cache/flutter_web_sdk/libraries.json --packages C:\Users\tony\Desktop\projects\todo2.dart_tool\package_config.json
-Ddart.vm.profile=false -Ddart.vm.product=false --enable-asserts --track-widget-creation --filesystem-root
C:\Users\tony\AppData\Local\Temp\flutter_tools.dcb858fc\flutter_tools.cf1a50f7 --filesystem-scheme org-dartlang-app --initialize-from-dill
build\c7922d95bf4a2462b75c84a97c312edb.cache.dill.track.dill --platform file:///T:/flutter/bin/cache/flutter_web_sdk/kernel/flutter_ddc_sdk.dill
--no-sound-null-safety
[ +207 ms] <- compile org-dartlang-app:/web_entrypoint.dart

Above I have attached screenshot of main.dart file and homescreen file I have used any plugin
When I hot Restarted for 10 times continuoslly it gave TextSpan error

here is the error
Multiple devices found:
Chrome (web) • chrome • web-javascript • Google Chrome 88.0.4324.150
Edge (web)   • edge   • web-javascript • Microsoft Edge 88.0.705.63
[1]: Chrome (chrome)
[2]: Edge (edge)
Please choose one (To quit, press "q/Q"): 1
Launching lib\main.dart on Chrome in debug mode...
Waiting for connection from debug service on Chrome...             38.0s
Debug service listening on ws://<IP_ADDRESS>:51908/Hfl_d-gCut0=/ws
Running with unsound null safety
For more information see https://dart.dev/null-safety/unsound-null-safety
Warning: Flutter's support for web development is not stable yet and hasn't
been thoroughly tested in production environments.
For more information see https://flutter.dev/web
To hot restart changes while running, press "r" or "R".
For a more detailed help message, press "h". To quit, press "q".
Performing hot restart...                                          334ms
Restarted application in 338ms.
Performing hot restart...                                          266ms
Restarted application in 268ms.
Performing hot restart...                                        1,105ms
Restarted application in 1,112ms.
Performing hot restart...                                          679ms
Restarted application in 680ms.
Performing hot restart...                                          929ms
Restarted application in 931ms.
Performing hot restart...                                          860ms
Restarted application in 861ms.
Performing hot restart...                                          295ms
Restarted application in 296ms.
Error: Unexpected null value.
at Object.throw_ [as throw] (http://localhost:51853/dart_sdk.js:5331:11)
at Object.nullCheck (http://localhost:51853/dart_sdk.js:5664:30)
at Object.get skiaFontCollection [as skiaFontCollection] (http://localhost:51853/dart_sdk.js:185083:19)
at Object._getEffectiveFontFamilies (http://localhost:51853/dart_sdk.js:181655:35)
at Function.toSkTextStyleProperties (http://localhost:51853/dart_sdk.js:144434:42)
at Function.toSkParagraphStyle (http://localhost:51853/dart_sdk.js:144483:55)
at new _engine.CkParagraphStyle.new (http://localhost:51853/dart_sdk.js:144504:55)
at Function.new (http://localhost:51853/dart_sdk.js:133227:16)
at DefaultShaderWarmUp.warmUpOnCanvas (http://localhost:51853/packages/flutter/src/painting/shader_warm_up.dart.lib.js:242:85)
at warmUpOnCanvas.next ()
at runBody (http://localhost:51853/dart_sdk.js:39049:34)
at Object._async [as async] (http://localhost:51853/dart_sdk.js:39080:7)
at DefaultShaderWarmUp.warmUpOnCanvas (http://localhost:51853/packages/flutter/src/painting/shader_warm_up.dart.lib.js:182:20)
at DefaultShaderWarmUp.execute (http://localhost:51853/packages/flutter/src/painting/shader_warm_up.dart.lib.js:116:20)
at execute.next ()
at runBody (http://localhost:51853/dart_sdk.js:39049:34)
at Object._async [as async] (http://localhost:51853/dart_sdk.js:39080:7)
at DefaultShaderWarmUp.execute (http://localhost:51853/packages/flutter/src/painting/shader_warm_up.dart.lib.js:113:20)
at binding$5.WidgetsFlutterBinding.new.initInstances (http://localhost:51853/packages/flutter/src/painting/binding.dart.lib.js:75:30)
at binding$5.WidgetsFlutterBinding.new.initInstances (http://localhost:51853/packages/flutter/src/semantics/binding.dart.lib.js:42:13)
at binding$5.WidgetsFlutterBinding.new.initInstances (http://localhost:51853/packages/flutter/src/rendering/layer.dart.lib.js:5934:13)
at binding$5.WidgetsFlutterBinding.new.initInstances (http://localhost:51853/packages/flutter/src/widgets/widget_span.dart.lib.js:51407:13)
at binding$5.WidgetsFlutterBinding.new.binding.BindingBase.new
(http://localhost:51853/packages/flutter/src/foundation/binding.dart.lib.js:371:10)
at binding$5.WidgetsFlutterBinding.new.BindingBase_GestureBinding$36.new
(http://localhost:51853/packages/flutter/src/widgets/widget_span.dart.lib.js:51984:49)
at binding$5.WidgetsFlutterBinding.new.BindingBase_SchedulerBinding$36.new
(http://localhost:51853/packages/flutter/src/widgets/widget_span.dart.lib.js:51990:51)
at binding$5.WidgetsFlutterBinding.new.BindingBase_ServicesBinding$36.new
(http://localhost:51853/packages/flutter/src/widgets/widget_span.dart.lib.js:51996:50)
at binding$5.WidgetsFlutterBinding.new.BindingBase_PaintingBinding$36.new
(http://localhost:51853/packages/flutter/src/widgets/widget_span.dart.lib.js:52002:50)
at binding$5.WidgetsFlutterBinding.new.BindingBase_SemanticsBinding$36.new
(http://localhost:51853/packages/flutter/src/widgets/widget_span.dart.lib.js:52008:51)
at binding$5.WidgetsFlutterBinding.new.BindingBase_RendererBinding$36.new
(http://localhost:51853/packages/flutter/src/widgets/widget_span.dart.lib.js:52014:50)
at binding$5.WidgetsFlutterBinding.new.BindingBase_WidgetsBinding$36.new
(http://localhost:51853/packages/flutter/src/widgets/widget_span.dart.lib.js:52020:49)
at new binding$5.WidgetsFlutterBinding.new (http://localhost:51853/packages/flutter/src/widgets/widget_span.dart.lib.js:52030:51)
at Function.ensureInitialized (http://localhost:51853/packages/flutter/src/widgets/widget_span.dart.lib.js:52025:54)
at Object.runApp (http://localhost:51853/packages/flutter/src/widgets/widget_span.dart.lib.js:52039:43)
at main$ (http://localhost:51853/packages/todo2/main.dart.lib.js:134:13)
at main (http://localhost:51853/web_entrypoint.dart.lib.js:46:29)
at main.next ()
at http://localhost:51853/dart_sdk.js:39029:33
at _RootZone.runUnary (http://localhost:51853/dart_sdk.js:38886:58)
at _FutureListener.thenAwait.handleValue (http://localhost:51853/dart_sdk.js:33872:29)
at handleValueCallback (http://localhost:51853/dart_sdk.js:34432:49)
at Function._propagateToListeners (http://localhost:51853/dart_sdk.js:34470:17)
at _Future.new.[_completeWithValue] (http://localhost:51853/dart_sdk.js:34312:23)
at http://localhost:51853/dart_sdk.js:33523:46
at _RootZone.runUnary (http://localhost:51853/dart_sdk.js:38886:58)
at _FutureListener.then.handleValue (http://localhost:51853/dart_sdk.js:33872:29)
at handleValueCallback (http://localhost:51853/dart_sdk.js:34432:49)
at Function._propagateToListeners (http://localhost:51853/dart_sdk.js:34470:17)
at _Future.new.[_completeWithValue] (http://localhost:51853/dart_sdk.js:34312:23)
at async._AsyncCallbackEntry.new.callback (http://localhost:51853/dart_sdk.js:34335:35)
at Object._microtaskLoop (http://localhost:51853/dart_sdk.js:39173:13)
at _startMicrotaskLoop (http://localhost:51853/dart_sdk.js:39179:13)
at http://localhost:51853/dart_sdk.js:34686:9
Performing hot restart...                                              -══╡ EXCEPTION CAUGHT BY RENDERING LIBRARY ╞═════════════════════════════════════════════════════════
The following TypeErrorImpl was thrown during performLayout():
Unexpected null value.
The relevant error-causing widget was:
Text file:///C:/Users/tony/Desktop/projects/todo2/lib/screens/homeScreen.dart:9:18
When the exception was thrown, this was the stack:
C:/b/s/w/ir/cache/builder/src/out/host_debug/dart-sdk/lib/internal/js_dev_runtime/private/ddc_runtime/errors.dart 236:49      throw
C:/b/s/w/ir/cache/builder/src/out/host_debug/dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/operations.dart 518:63  nullCheck
C:/b/s/w/ir/cache/builder/src/out/host_debug/flutter_web_sdk/lib/_engine/engine/canvaskit/initialization.dart 109:65           get
skiaFontCollection
C:/b/s/w/ir/cache/builder/src/out/host_debug/flutter_web_sdk/lib/_engine/engine/canvaskit/text.dart 869:42
_getEffectiveFontFamilies
C:/b/s/w/ir/cache/builder/src/out/host_debug/flutter_web_sdk/lib/_engine/engine/canvaskit/text.dart 65:32
toSkTextStyleProperties
C:/b/s/w/ir/cache/builder/src/out/host_debug/flutter_web_sdk/lib/_engine/engine/canvaskit/text.dart 147:9                      toSkParagraphStyle
C:/b/s/w/ir/cache/builder/src/out/host_debug/flutter_web_sdk/lib/_engine/engine/canvaskit/text.dart 23:27                      new
C:/b/s/w/ir/cache/builder/src/out/host_debug/flutter_web_sdk/lib/ui/src/ui/text.dart 322:21                                    new
packages/flutter/src/painting/text_style.dart 1089:15                                                                          getParagraphStyle
packages/flutter/src/painting/text_painter.dart 416:26
[_createParagraphStyle]
packages/flutter/src/painting/text_painter.dart 568:63                                                                         layout
packages/flutter/src/rendering/paragraph.dart 515:18                                                                           [_layoutText]
packages/flutter/src/rendering/paragraph.dart 538:5
[_layoutTextWithConstraints]
packages/flutter/src/rendering/paragraph.dart 651:5                                                                            performLayout
packages/flutter/src/rendering/object.dart 1784:7                                                                              layout
packages/flutter/src/rendering/shifted_box.dart 430:7                                                                          performLayout
packages/flutter/src/rendering/object.dart 1784:7                                                                              layout
packages/flutter/src/rendering/custom_layout.dart 171:10                                                                       layoutChild
packages/flutter/src/material/scaffold.dart 925:7                                                                              performLayout
packages/flutter/src/rendering/custom_layout.dart 243:7
[_callPerformLayout]
packages/flutter/src/rendering/custom_layout.dart 407:14                                                                       performLayout
packages/flutter/src/rendering/object.dart 1784:7                                                                              layout
packages/flutter/src/rendering/proxy_box.dart 118:7                                                                            performLayout
packages/flutter/src/rendering/object.dart 1784:7                                                                              layout
packages/flutter/src/rendering/proxy_box.dart 118:7                                                                            performLayout
packages/flutter/src/rendering/proxy_box.dart 1371:11                                                                          performLayout
packages/flutter/src/rendering/object.dart 1784:7                                                                              layout
packages/flutter/src/rendering/proxy_box.dart 118:7                                                                            performLayout
packages/flutter/src/rendering/object.dart 1784:7                                                                              layout
packages/flutter/src/rendering/proxy_box.dart 118:7                                                                            performLayout
packages/flutter/src/rendering/object.dart 1784:7                                                                              layout
packages/flutter/src/rendering/proxy_box.dart 118:7                                                                            performLayout
packages/flutter/src/rendering/object.dart 1784:7                                                                              layout
packages/flutter/src/rendering/proxy_box.dart 118:7                                                                            performLayout
packages/flutter/src/rendering/object.dart 1784:7                                                                              layout
packages/flutter/src/rendering/proxy_box.dart 118:7                                                                            performLayout
packages/flutter/src/rendering/object.dart 1784:7                                                                              layout
packages/flutter/src/rendering/proxy_box.dart 118:7                                                                            performLayout
packages/flutter/src/rendering/object.dart 1784:7                                                                              layout
packages/flutter/src/rendering/proxy_box.dart 118:7                                                                            performLayout
packages/flutter/src/rendering/object.dart 1784:7                                                                              layout
packages/flutter/src/rendering/proxy_box.dart 118:7                                                                            performLayout
packages/flutter/src/rendering/proxy_box.dart 3362:13                                                                          performLayout
packages/flutter/src/rendering/object.dart 1784:7                                                                              layout
packages/flutter/src/rendering/proxy_box.dart 118:7                                                                            performLayout
packages/flutter/src/rendering/object.dart 1784:7                                                                              layout
packages/flutter/src/widgets/overlay.dart 743:14                                                                               performLayout
packages/flutter/src/rendering/object.dart 1784:7                                                                              layout
packages/flutter/src/rendering/proxy_box.dart 118:7                                                                            performLayout
packages/flutter/src/rendering/object.dart 1784:7                                                                              layout
packages/flutter/src/rendering/proxy_box.dart 118:7                                                                            performLayout
packages/flutter/src/rendering/object.dart 1784:7                                                                              layout
packages/flutter/src/rendering/proxy_box.dart 118:7                                                                            performLayout
packages/flutter/src/rendering/object.dart 1784:7                                                                              layout
packages/flutter/src/rendering/proxy_box.dart 118:7                                                                            performLayout
packages/flutter/src/rendering/object.dart 1784:7                                                                              layout
packages/flutter/src/rendering/proxy_box.dart 118:7                                                                            performLayout
packages/flutter/src/rendering/object.dart 1784:7                                                                              layout
packages/flutter/src/rendering/view.dart 153:7                                                                                performLayout
packages/flutter/src/rendering/object.dart 1641:7
[_layoutWithoutResize]
packages/flutter/src/rendering/object.dart 884:17                                                                              flushLayout
packages/flutter/src/rendering/binding.dart 453:19                                                                             drawFrame
packages/flutter/src/widgets/binding.dart 874:13                                                                               drawFrame
packages/flutter/src/rendering/binding.dart 319:5
[_handlePersistentFrameCallback]
packages/flutter/src/scheduler/binding.dart 1144:15
[_invokeFrameCallback]
packages/flutter/src/scheduler/binding.dart 1082:9                                                                             handleDrawFrame
packages/flutter/src/scheduler/binding.dart 865:7
C:/b/s/w/ir/cache/builder/src/out/host_debug/dart-sdk/lib/_internal/js_dev_runtime/private/isolate_helper.dart 48:19           internalCallback
The following RenderObject was being processed when the exception was fired: RenderParagraph#7fe4c relayoutBoundary=up2 NEEDS-LAYOUT NEEDS-PAINT:
creator: RichText ← Text ← Center ← Container ← _BodyBuilder ← MediaQuery ←
LayoutId-[<_ScaffoldSlot.body>] ← CustomMultiChildLayout ← AnimatedBuilder ← DefaultTextStyle ←
AnimatedDefaultTextStyle ← InkFeatures-[GlobalKey#cd334 ink renderer] ← ⋯
parentData: offset=Offset(0.0, 0.0) (can use size)
constraints: BoxConstraints(0.0<=w<=1034.0, 0.0<=h<=620.0)
size: MISSING
textAlign: start
textDirection: ltr
softWrap: wrapping at box width
overflow: clip
locale: en_US
maxLines: unlimited
This RenderObject had the following child:
text: TextSpan
════════════════════════════════════════════════════════════════════════════════════════════════════
Another exception was thrown: Assertion failed: file:///T:/flutter/packages/flutter/lib/src/rendering/shifted_box.dart:341:12
Another exception was thrown: Unexpected null value.
Another exception was thrown: Assertion failed: file:///T:/flutter/packages/flutter/lib/src/rendering/shifted_box.dart:341:12
Another exception was thrown: Unexpected null value.
Another exception was thrown: Unexpected null value.
3.4s
Restarted application in 3,386ms.
Error: Unexpected null value.
at Object.throw [as throw] (http://localhost:51853/dart_sdk.js:5331:11)
at Object.nullCheck (http://localhost:51853/dart_sdk.js:5664:30)
at Object.get skiaFontCollection [as skiaFontCollection] (http://localhost:51853/dart_sdk.js:185083:19)
at _initializePlatform (http://localhost:51853/dart_sdk.js:134201:23)
at _initializePlatform.next ()
at http://localhost:51853/dart_sdk.js:39029:33
at _RootZone.runUnary (http://localhost:51853/dart_sdk.js:38886:58)
at _FutureListener.thenAwait.handleValue (http://localhost:51853/dart_sdk.js:33872:29)
at handleValueCallback (http://localhost:51853/dart_sdk.js:34432:49)
at Function._propagateToListeners (http://localhost:51853/dart_sdk.js:34470:17)
at _Future.new.[_completeWithValue] (http://localhost:51853/dart_sdk.js:34312:23)
at async._AsyncCallbackEntry.new.callback (http://localhost:51853/dart_sdk.js:34335:35)
at Object._microtaskLoop (http://localhost:51853/dart_sdk.js:39173:13)
at _startMicrotaskLoop (http://localhost:51853/dart_sdk.js:39179:13)
at http://localhost:51853/dart_sdk.js:34686:9
Performing hot restart...                                         193.0s
hotRestart: (-32000) Service connection disposed
Application finished.
PS C:\Users\tony\Desktop\projects\todo2>

Hi @rakeshcoolrex
Repeatedly hitting hot-restart on other platforms, gives the following lines
[  +80 ms] Updating files.
[  +32 ms] DevFS: Sync finished
[        ] Syncing files to device macOS... (completed in 113ms)
[        ] Synced 25.3MB.
[        ] <- accept
[  +14 ms] Ignoring terminal input: "R" because we are busy.
[ +164 ms] Ignoring terminal input: "R" because we are busy.
[ +149 ms] Ignoring terminal input: "R" because we are busy.
[ +179 ms] Ignoring terminal input: "R" because we are busy.
[  +36 ms] Hot restart performed in 663ms.
[        ] Performing hot restart... (completed in 664ms)
[        ] Restarted application in 666ms.

But on the web, it's not working like this, I can reproduce  it  on mac and windows on all channels supporting web

logs
[  +29 ms] Exit code 0 from: git rev-parse --abbrev-ref --symbolic @{u}
[   +1 ms] origin/master
[   +1 ms] executing: [C:\Users\Taha\Code\flutter_master/] git ls-remote --get-url origin
[  +34 ms] Exit code 0 from: git ls-remote --get-url origin
[   +1 ms] https://github.com/flutter/flutter.git
[  +57 ms] executing: [C:\Users\Taha\Code\flutter_master/] git rev-parse --abbrev-ref HEAD
[  +29 ms] Exit code 0 from: git rev-parse --abbrev-ref HEAD
[   +1 ms] master
[  +49 ms] Artifact Instance of 'AndroidGenSnapshotArtifacts' is not required, skipping update.
[   +5 ms] Artifact Instance of 'AndroidInternalBuildArtifacts' is not required, skipping update.
[   +4 ms] Artifact Instance of 'IOSEngineArtifacts' is not required, skipping update.
[   +1 ms] Artifact Instance of 'FlutterWebSdk' is not required, skipping update.
[   +3 ms] Artifact Instance of 'WindowsEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'MacOSEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'LinuxEngineArtifacts' is not required, skipping update.
[   +9 ms] Artifact Instance of 'LinuxFuchsiaSDKArtifacts' is not required, skipping update.
[   +1 ms] Artifact Instance of 'MacOSFuchsiaSDKArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'FlutterRunnerSDKArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'FlutterRunnerDebugSymbols' is not required, skipping update.
[  +67 ms] executing: C:\Users\Taha\Code\SDK\platform-tools\adb.exe devices -l
[  +42 ms] Artifact Instance of 'AndroidGenSnapshotArtifacts' is not required, skipping update.
[   +1 ms] Artifact Instance of 'AndroidInternalBuildArtifacts' is not required, skipping update.
[   +1 ms] Artifact Instance of 'IOSEngineArtifacts' is not required, skipping update.
[  +24 ms] Artifact Instance of 'WindowsEngineArtifacts' is not required, skipping update.
[   +5 ms] Artifact Instance of 'MacOSEngineArtifacts' is not required, skipping update.
[   +1 ms] Artifact Instance of 'LinuxEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'LinuxFuchsiaSDKArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'MacOSFuchsiaSDKArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'FlutterRunnerSDKArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'FlutterRunnerDebugSymbols' is not required, skipping update.
[  +58 ms] executing: C:\Users\Taha\Code\SDK\platform-tools\adb.exe devices -l
[  +15 ms] Skipping pub get: version match.
[  +95 ms] Generating
C:\Users\Taha\AndroidStudioProjects\master_flutter\android\app\src\main\java\io\flutter\plugins\GeneratedPluginRegistrant.java
[  +91 ms] List of devices attached
[  +38 ms] Launching lib\main.dart on Chrome in debug mode...
[  +28 ms] List of devices attached
[  +80 ms] Updating assets
[ +130 ms] Waiting for connection from debug service on Chrome...
[ +156 ms] <- reset
[   +6 ms] C:\Users\Taha\Code\flutter_master\bin\cache\dart-sdk\bin\dart.exe --disable-dart-dev
C:\Users\Taha\Code\flutter_master\bin\cache\artifacts\engine\windows-x64\frontend_server.dart.snapshot --sdk-root
C:\Users\Taha\Code\flutter_master\bin\cache\flutter_web_sdk/ --incremental --target=dartdevc --debugger-module-names
--experimental-emit-debug-metadata -DFLUTTER_WEB_AUTO_DETECT=true --output-dill
C:\Users\Taha\AppData\Local\Temp\flutter_tools.effc125a\flutter_tool.4bac64b5\app.dill --libraries-spec
file:///C:/Users/Taha/Code/flutter_master/bin/cache/flutter_web_sdk/libraries.json --packages
C:\Users\Taha\AndroidStudioProjects\master_flutter\.dart_tool\package_config.json -Ddart.vm.profile=false
-Ddart.vm.product=false --enable-asserts --track-widget-creation --filesystem-root
C:\Users\Taha\AppData\Local\Temp\flutter_tools.effc125a\flutter_tools.ff537362 --filesystem-scheme org-dartlang-app
--initialize-from-dill build\c7922d95bf4a2462b75c84a97c312edb.cache.dill.track.dill --platform
file:///C:/Users/Taha/Code/flutter_master/bin/cache/flutter_web_sdk/kernel/flutter_ddc_sdk.dill --no-sound-null-safety
[  +16 ms] <- compile org-dartlang-app:/web_entrypoint.dart
[+13358 ms] Waiting for connection from debug service on Chrome... (completed in 13.5s)
[   +2 ms] Synced 29.2MB.
[   +1 ms] <- accept
[  +15 ms] Caching compiled dill
[ +167 ms] Using Opening in existing browser session.

[ +198 ms] [CHROME]:
[  +16 ms] [CHROME]:DevTools listening on ws://<IP_ADDRESS>:52039/devtools/browser/953c129f-2175-41bf-9286-2c22f538fbe7
[+1172 ms] DwdsInjector: Received request for entrypoint at http://localhost:52021/main_module.bootstrap.js
[   +5 ms] MetadataProvider: Loading debug metadata...
[  +10 ms] MetadataProvider: Loaded debug metadata (no sound null safety)
[   +5 ms] DwdsInjector: Injected debugging metadata for entrypoint at http://localhost:52021/main_module.bootstrap.js
[+4796 ms] ChromeProxyService: Initializing expression compiler for main_module.bootstrap.js with sound null safety: false
[ +332 ms] DevHandler: Debug service listening on ws://<IP_ADDRESS>:52061/TLbS4h66CjA=/ws

[   +9 ms] Debug service listening on ws://<IP_ADDRESS>:52061/TLbS4h66CjA=/ws
[   +1 ms] Running with unsound null safety
[        ] For more information see https://dart.dev/null-safety/unsound-null-safety
[   +2 ms]   To hot restart changes while running, press "r" or "R".
[   +1 ms] For a more detailed help message, press "h". To quit, press "q".
[+31598 ms] Performing hot restart...
[   +5 ms] Initializing file store
[  +14 ms] Skipping target: gen_localizations
[   +9 ms] complete
[  +55 ms] Scanned through 512 files in 47ms
[   +1 ms] Waiting for connection from debug service on Chrome...
[   +2 ms] <- recompile org-dartlang-app:/web_entrypoint.dart a68bdc2c-6d0a-40c6-870e-fd2c1f4ba244
[   +6 ms] <- a68bdc2c-6d0a-40c6-870e-fd2c1f4ba244
[  +14 ms] Waiting for connection from debug service on Chrome... (completed in 21ms)
[   +1 ms] Synced 0.0MB.
[   +6 ms] <- accept
[   +4 ms] DwdsVmClient: Attempting a hot restart
[        ] DwdsVmClient: Attempting to disabling breakpoints and resume the isolate
[   +6 ms] DwdsVmClient: Successfully disabled breakpoints and resumed the isolate
[   +4 ms] DwdsVmClient: Attempting to get execution context ID.
[   +1 ms] DwdsVmClient: Got execution context ID.
[        ] DwdsVmClient: Issuing $dartHotRestart request.
[   +2 ms] Ignoring terminal input: "R" because we are busy.
[  +33 ms] ChromeProxyService: Initializing expression compiler for main_module.bootstrap.js with sound null safety: false
[  +16 ms] DwdsVmClient: $dartHotRestart request complete.
[   +6 ms] DwdsVmClient: Waiting for Isolate Start event.
[   +1 ms] DwdsVmClient: Successful hot restart
[   +7 ms] Performing hot restart... (completed in 200ms)
[   +2 ms] Restarted application in 205ms.
[  +73 ms] Performing hot restart...
[   +2 ms] Skipping target: gen_localizations
[   +1 ms] complete
[  +43 ms] Scanned through 512 files in 37ms
[   +1 ms] Waiting for connection from debug service on Chrome...
[   +1 ms] <- recompile org-dartlang-app:/web_entrypoint.dart 17b3589b-9763-47cb-b599-809da2d9e3b7
[        ] <- 17b3589b-9763-47cb-b599-809da2d9e3b7
[  +29 ms] Waiting for connection from debug service on Chrome... (completed in 30ms)
[        ] Synced 0.0MB.
[        ] <- accept
[        ] DwdsVmClient: Attempting a hot restart
[        ] DwdsVmClient: Attempting to disabling breakpoints and resume the isolate
[   +2 ms] DwdsVmClient: Successfully disabled breakpoints and resumed the isolate
[        ] DwdsVmClient: Attempting to get execution context ID.
[        ] DwdsVmClient: Got execution context ID.
[   +6 ms] DwdsVmClient: Issuing $dartHotRestart request.
[  +47 ms] Ignoring terminal input: "R" because we are busy.
[  +17 ms] ChromeProxyService: Initializing expression compiler for main_module.bootstrap.js with sound null safety: false
[  +15 ms] DwdsVmClient: $dartHotRestart request complete.
[   +4 ms] DwdsVmClient: Waiting for Isolate Start event.
[   +2 ms] DwdsVmClient: Successful hot restart
[   +1 ms] Performing hot restart... (completed in 180ms)
[   +1 ms] Restarted application in 183ms.
[  +82 ms] Performing hot restart...
[   +2 ms] Skipping target: gen_localizations
[   +6 ms] complete
[  +38 ms] Scanned through 512 files in 34ms
[   +1 ms] Waiting for connection from debug service on Chrome...
[   +1 ms] <- recompile org-dartlang-app:/web_entrypoint.dart 65223ca5-d008-406c-af6c-43267dcd65ed
[   +5 ms] <- 65223ca5-d008-406c-af6c-43267dcd65ed
[  +43 ms] Waiting for connection from debug service on Chrome... (completed in 49ms)
[   +9 ms] Synced 0.0MB.
[  +21 ms] <- accept
[        ] DwdsVmClient: Attempting a hot restart
[        ] DwdsVmClient: Attempting to disabling breakpoints and resume the isolate
[   +2 ms] DwdsVmClient: Successfully disabled breakpoints and resumed the isolate
[  +13 ms] DwdsVmClient: Attempting to get execution context ID.
[   +1 ms] DwdsVmClient: Got execution context ID.
[        ] DwdsVmClient: Issuing $dartHotRestart request.
[   +1 ms] Ignoring terminal input: "R" because we are busy.
[ +110 ms] Ignoring terminal input: "R" because we are busy.
[ +111 ms] ChromeProxyService: Initializing expression compiler for main_module.bootstrap.js with sound null safety: false
[  +10 ms] DwdsVmClient: $dartHotRestart request complete.
[   +2 ms] DwdsVmClient: Waiting for Isolate Start event.
[  +15 ms] Ignoring terminal input: "R" because we are busy.
[   +6 ms] DwdsVmClient: Successful hot restart
[   +3 ms] Performing hot restart... (completed in 412ms)
[   +3 ms] Restarted application in 417ms.
[ +150 ms] Performing hot restart...
[   +2 ms] Skipping target: gen_localizations
[   +1 ms] complete
[  +40 ms] Scanned through 512 files in 36ms
[   +2 ms] Waiting for connection from debug service on Chrome...
[   +1 ms] <- recompile org-dartlang-app:/web_entrypoint.dart 3fa1ba2d-04e3-4f85-9690-ae8fa3c3a5e4
[        ] <- 3fa1ba2d-04e3-4f85-9690-ae8fa3c3a5e4
[  +15 ms] Waiting for connection from debug service on Chrome... (completed in 16ms)
[        ] Synced 0.0MB.
[        ] <- accept
[        ] DwdsVmClient: Attempting a hot restart
[   +5 ms] DwdsVmClient: Attempting to disabling breakpoints and resume the isolate
[  +10 ms] DwdsVmClient: Successfully disabled breakpoints and resumed the isolate
[        ] DwdsVmClient: Attempting to get execution context ID.
[        ] DwdsVmClient: Got execution context ID.
[        ] DwdsVmClient: Issuing $dartHotRestart request.
[  +29 ms] Ignoring terminal input: "R" because we are busy.
[  +50 ms] ChromeProxyService: Initializing expression compiler for main_module.bootstrap.js with sound null safety: false
[   +7 ms] DwdsVmClient: $dartHotRestart request complete.
[   +2 ms] DwdsVmClient: Waiting for Isolate Start event.
[   +2 ms] DwdsVmClient: Successful hot restart
[        ] Performing hot restart... (completed in 177ms)
[        ] Restarted application in 179ms.
[  +96 ms] Performing hot restart...
[   +2 ms] Skipping target: gen_localizations
[   +1 ms] complete
[  +39 ms] Scanned through 512 files in 34ms
[   +1 ms] Waiting for connection from debug service on Chrome...
[   +1 ms] <- recompile org-dartlang-app:/web_entrypoint.dart bbf3d09a-ccc0-4477-a20c-5f8411b1ca93
[   +6 ms] <- bbf3d09a-ccc0-4477-a20c-5f8411b1ca93
[  +37 ms] Waiting for connection from debug service on Chrome... (completed in 44ms)
[        ] Synced 0.0MB.
[        ] <- accept
[        ] DwdsVmClient: Attempting a hot restart
[   +6 ms] DwdsVmClient: Attempting to disabling breakpoints and resume the isolate
[  +13 ms] DwdsVmClient: Successfully disabled breakpoints and resumed the isolate
[   +5 ms] DwdsVmClient: Attempting to get execution context ID.
[   +1 ms] DwdsVmClient: Got execution context ID.
[        ] DwdsVmClient: Issuing $dartHotRestart request.
[  +20 ms] Ignoring terminal input: "R" because we are busy.
[ +102 ms] ChromeProxyService: Initializing expression compiler for main_module.bootstrap.js with sound null safety: false
[  +12 ms] DwdsVmClient: $dartHotRestart request complete.
[   +1 ms] DwdsVmClient: Waiting for Isolate Start event.
[  +13 ms] DwdsVmClient: Successful hot restart
[   +1 ms] Performing hot restart... (completed in 271ms)
[        ] Restarted application in 273ms.
[  +25 ms] Performing hot restart...
[   +1 ms] Skipping target: gen_localizations
[   +2 ms] complete
[  +44 ms] Scanned through 512 files in 43ms
[   +1 ms] Waiting for connection from debug service on Chrome...
[   +1 ms] <- recompile org-dartlang-app:/web_entrypoint.dart e4615333-cb17-4980-a6fa-61d104988dac
[   +9 ms] <- e4615333-cb17-4980-a6fa-61d104988dac
[   +9 ms] Waiting for connection from debug service on Chrome... (completed in 19ms)
[   +3 ms] Synced 0.0MB.
[   +1 ms] <- accept
[   +1 ms] DwdsVmClient: Attempting a hot restart
[        ] DwdsVmClient: Attempting to disabling breakpoints and resume the isolate
[   +2 ms] DwdsVmClient: Successfully disabled breakpoints and resumed the isolate
[        ] DwdsVmClient: Attempting to get execution context ID.
[        ] DwdsVmClient: Got execution context ID.
[   +6 ms] DwdsVmClient: Issuing $dartHotRestart request.
[  +58 ms] ChromeProxyService: Initializing expression compiler for main_module.bootstrap.js with sound null safety: false
[  +11 ms] DwdsVmClient: $dartHotRestart request complete.
[   +1 ms] DwdsVmClient: Waiting for Isolate Start event.
[   +1 ms] Ignoring terminal input: "R" because we are busy.
[  +13 ms] DwdsVmClient: Successful hot restart
[        ] Performing hot restart... (completed in 172ms)
[        ] Restarted application in 174ms.
[  +25 ms] Error: Unexpected null value.
               at Object.throw_ [as throw] (http://localhost:52021/dart_sdk.js:5342:11)
               at Object.nullCheck (http://localhost:52021/dart_sdk.js:5675:30)
               at Object.get skiaFontCollection [as skiaFontCollection] (http://localhost:52021/dart_sdk.js:186049:19)
               at Object._getEffectiveFontFamilies (http://localhost:52021/dart_sdk.js:182611:35)
               at Function.toSkTextStyleProperties (http://localhost:52021/dart_sdk.js:144879:42)
               at Function.toSkParagraphStyle (http://localhost:52021/dart_sdk.js:144928:55)
               at new _engine.CkParagraphStyle.new (http://localhost:52021/dart_sdk.js:144949:55)
               at Function.new (http://localhost:52021/dart_sdk.js:133636:16)
               at DefaultShaderWarmUp.warmUpOnCanvas
               (http://localhost:52021/packages/flutter/src/painting/shader_warm_up.dart.lib.js:242:85)
               at warmUpOnCanvas.next (<anonymous>)
               at runBody (http://localhost:52021/dart_sdk.js:39177:34)
               at Object._async [as async] (http://localhost:52021/dart_sdk.js:39208:7)
               at DefaultShaderWarmUp.warmUpOnCanvas
               (http://localhost:52021/packages/flutter/src/painting/shader_warm_up.dart.lib.js:182:20)
               at DefaultShaderWarmUp.execute
(http://localhost:52021/packages/flutter/src/painting/shader_warm_up.dart.lib.js:116:20)
               at execute.next (<anonymous>)
               at runBody (http://localhost:52021/dart_sdk.js:39177:34)
               at Object._async [as async] (http://localhost:52021/dart_sdk.js:39208:7)
               at DefaultShaderWarmUp.execute
(http://localhost:52021/packages/flutter/src/painting/shader_warm_up.dart.lib.js:113:20)
               at binding$5.WidgetsFlutterBinding.new.initInstances
               (http://localhost:52021/packages/flutter/src/painting/binding.dart.lib.js:75:30)
               at binding$5.WidgetsFlutterBinding.new.initInstances
               (http://localhost:52021/packages/flutter/src/semantics/binding.dart.lib.js:42:13)
               at binding$5.WidgetsFlutterBinding.new.initInstances
               (http://localhost:52021/packages/flutter/src/rendering/layer.dart.lib.js:5934:13)
               at binding$5.WidgetsFlutterBinding.new.initInstances
               (http://localhost:52021/packages/flutter/src/widgets/widget_span.dart.lib.js:51963:13)
               at binding$5.WidgetsFlutterBinding.new.binding.BindingBase.new
               (http://localhost:52021/packages/flutter/src/foundation/binding.dart.lib.js:371:10)
               at binding$5.WidgetsFlutterBinding.new.BindingBase_GestureBinding$36.new
               (http://localhost:52021/packages/flutter/src/widgets/widget_span.dart.lib.js:52540:49)
               at binding$5.WidgetsFlutterBinding.new.BindingBase_SchedulerBinding$36.new
               (http://localhost:52021/packages/flutter/src/widgets/widget_span.dart.lib.js:52546:51)
               at binding$5.WidgetsFlutterBinding.new.BindingBase_ServicesBinding$36.new
               (http://localhost:52021/packages/flutter/src/widgets/widget_span.dart.lib.js:52552:50)
               at binding$5.WidgetsFlutterBinding.new.BindingBase_PaintingBinding$36.new
               (http://localhost:52021/packages/flutter/src/widgets/widget_span.dart.lib.js:52558:50)
               at binding$5.WidgetsFlutterBinding.new.BindingBase_SemanticsBinding$36.new
               (http://localhost:52021/packages/flutter/src/widgets/widget_span.dart.lib.js:52564:51)
               at binding$5.WidgetsFlutterBinding.new.BindingBase_RendererBinding$36.new
               (http://localhost:52021/packages/flutter/src/widgets/widget_span.dart.lib.js:52570:50)
               at binding$5.WidgetsFlutterBinding.new.BindingBase_WidgetsBinding$36.new
               (http://localhost:52021/packages/flutter/src/widgets/widget_span.dart.lib.js:52576:49)
               at new binding$5.WidgetsFlutterBinding.new
               (http://localhost:52021/packages/flutter/src/widgets/widget_span.dart.lib.js:52586:51)
               at Function.ensureInitialized
(http://localhost:52021/packages/flutter/src/widgets/widget_span.dart.lib.js:52581:54)
               at Object.runApp (http://localhost:52021/packages/flutter/src/widgets/widget_span.dart.lib.js:52595:43)
               at main$ (http://localhost:52021/packages/master_flutter/main.dart.lib.js:253:20)
               at main (http://localhost:52021/web_entrypoint.dart.lib.js:46:29)
               at main.next (<anonymous>)
               at http://localhost:52021/dart_sdk.js:39157:33
               at _RootZone.runUnary (http://localhost:52021/dart_sdk.js:39014:58)
               at _FutureListener.thenAwait.handleValue (http://localhost:52021/dart_sdk.js:34000:29)
               at handleValueCallback (http://localhost:52021/dart_sdk.js:34560:49)
               at Function._propagateToListeners (http://localhost:52021/dart_sdk.js:34598:17)
               at _Future.new.[_completeWithValue] (http://localhost:52021/dart_sdk.js:34440:23)
               at http://localhost:52021/dart_sdk.js:33651:46
               at _RootZone.runUnary (http://localhost:52021/dart_sdk.js:39014:58)
               at _FutureListener.then.handleValue (http://localhost:52021/dart_sdk.js:34000:29)
               at handleValueCallback (http://localhost:52021/dart_sdk.js:34560:49)
               at Function._propagateToListeners (http://localhost:52021/dart_sdk.js:34598:17)
               at _Future.new.[_completeWithValue] (http://localhost:52021/dart_sdk.js:34440:23)
               at async._AsyncCallbackEntry.new.callback (http://localhost:52021/dart_sdk.js:34463:35)
               at Object._microtaskLoop (http://localhost:52021/dart_sdk.js:39301:13)
               at _startMicrotaskLoop (http://localhost:52021/dart_sdk.js:39307:13)
               at http://localhost:52021/dart_sdk.js:34814:9
[ +120 ms] Performing hot restart...
[   +1 ms] Skipping target: gen_localizations
[   +1 ms] complete
[  +59 ms] Scanned through 512 files in 39ms
[   +1 ms] Waiting for connection from debug service on Chrome...
[   +1 ms] <- recompile org-dartlang-app:/web_entrypoint.dart 42100694-b5c2-4dcf-a4b6-f0778598d974
[   +6 ms] <- 42100694-b5c2-4dcf-a4b6-f0778598d974
[  +13 ms] Waiting for connection from debug service on Chrome... (completed in 19ms)
[   +7 ms] Synced 0.0MB.
[        ] <- accept
[  +10 ms] DwdsVmClient: Attempting a hot restart
[  +23 ms] DwdsVmClient: Attempting to disabling breakpoints and resume the isolate
[   +3 ms] DwdsVmClient: Successfully disabled breakpoints and resumed the isolate
[   +3 ms] DwdsVmClient: Attempting to get execution context ID.
[   +3 ms] DwdsVmClient: Got execution context ID.
[        ] DwdsVmClient: Issuing $dartHotRestart request.
[   +1 ms] Ignoring terminal input: "R" because we are busy.
[ +138 ms] Ignoring terminal input: "R" because we are busy.
[ +156 ms] Ignoring terminal input: "R" because we are busy.
[  +79 ms] ══╡ EXCEPTION CAUGHT BY RENDERING LIBRARY ╞═════════════════════════════════════════════════════════
[   +2 ms] The following TypeErrorImpl was thrown during performLayout():
[   +2 ms] Unexpected null value.
[  +29 ms] The relevant error-causing widget was:
[  +12 ms]   Text file:///C:/Users/Taha/AndroidStudioProjects/master_flutter/lib/main.dart:12:18
[   +2 ms] When the exception was thrown, this was the stack:
[   +1 ms] C:/b/s/w/ir/cache/builder/src/out/host_debug/dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart
236:49
           throw_
[  +40 ms]
C:/b/s/w/ir/cache/builder/src/out/host_debug/dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/operations.dart 518:63
           nullCheck
[  +10 ms] C:/b/s/w/ir/cache/builder/src/out/host_debug/flutter_web_sdk/lib/_engine/engine/canvaskit/initialization.dart 109:65           get skiaFontCollection
[   +1 ms] C:/b/s/w/ir/cache/builder/src/out/host_debug/flutter_web_sdk/lib/_engine/engine/canvaskit/text.dart 872:42
           _getEffectiveFontFamilies
[   +1 ms] C:/b/s/w/ir/cache/builder/src/out/host_debug/flutter_web_sdk/lib/_engine/engine/canvaskit/text.dart 65:32
           toSkTextStyleProperties
[        ] C:/b/s/w/ir/cache/builder/src/out/host_debug/flutter_web_sdk/lib/_engine/engine/canvaskit/text.dart 147:9
           toSkParagraphStyle
[  +19 ms] C:/b/s/w/ir/cache/builder/src/out/host_debug/flutter_web_sdk/lib/_engine/engine/canvaskit/text.dart 23:28
           new
[   +1 ms] C:/b/s/w/ir/cache/builder/src/out/host_debug/flutter_web_sdk/lib/ui/src/ui/text.dart 334:21
           new
[   +8 ms] packages/flutter/src/painting/text_style.dart 1089:15
           getParagraphStyle
[  +20 ms] packages/flutter/src/painting/text_painter.dart 416:26
           [_createParagraphStyle]
[  +13 ms] packages/flutter/src/painting/text_painter.dart 568:63
           layout
[   +3 ms] packages/flutter/src/rendering/paragraph.dart 515:18
           [_layoutText]
[   +2 ms] packages/flutter/src/rendering/paragraph.dart 538:5
           [_layoutTextWithConstraints]
[   +1 ms] packages/flutter/src/rendering/paragraph.dart 651:5
           performLayout
[   +6 ms] packages/flutter/src/rendering/object.dart 1784:7
           layout
[  +28 ms] packages/flutter/src/material/app_bar.dart 1867:5
           performLayout
[   +1 ms] packages/flutter/src/rendering/object.dart 1784:7
           layout
[   +2 ms] packages/flutter/src/rendering/proxy_box.dart 118:7
           performLayout
[   +1 ms] packages/flutter/src/rendering/object.dart 1784:7
           layout
[  +18 ms] packages/flutter/src/rendering/custom_layout.dart 171:10
           layoutChild
[   +1 ms] packages/flutter/src/widgets/navigation_toolbar.dart 148:31
           performLayout
[  +12 ms] packages/flutter/src/rendering/custom_layout.dart 243:7
           [_callPerformLayout]
[   +8 ms] packages/flutter/src/rendering/custom_layout.dart 407:14
           performLayout
[  +10 ms] packages/flutter/src/rendering/object.dart 1784:7
           layout
[   +1 ms] Ignoring terminal input: "R" because we are busy.
[  +20 ms] Ignoring terminal input: "R" because we are busy.
[  +90 ms] Ignoring terminal input: "R" because we are busy.
[  +16 ms] ChromeProxyService: Initializing expression compiler for main_module.bootstrap.js with sound null safety: false
[   +9 ms] DwdsVmClient: $dartHotRestart request complete.
[   +1 ms] DwdsVmClient: Waiting for Isolate Start event.
[  +15 ms] DwdsVmClient: Successful hot restart
[   +1 ms] Performing hot restart... (completed in 940ms)
[   +7 ms] Restarted application in 949ms.
[ +104 ms] Performing hot restart...
[   +2 ms] Skipping target: gen_localizations
[   +3 ms] complete
[  +37 ms] Scanned through 512 files in 33ms
[   +1 ms] Waiting for connection from debug service on Chrome...
[   +1 ms] <- recompile org-dartlang-app:/web_entrypoint.dart 51a14013-aede-4562-b313-4a87a865f716
[        ] <- 51a14013-aede-4562-b313-4a87a865f716
[  +24 ms] Waiting for connection from debug service on Chrome... (completed in 25ms)
[        ] Synced 0.0MB.
[        ] <- accept
[        ] DwdsVmClient: Attempting a hot restart
[        ] DwdsVmClient: Attempting to disabling breakpoints and resume the isolate
[   +3 ms] DwdsVmClient: Successfully disabled breakpoints and resumed the isolate
[   +5 ms] DwdsVmClient: Attempting to get execution context ID.
[   +5 ms] DwdsVmClient: Got execution context ID.
[        ] DwdsVmClient: Issuing $dartHotRestart request.
[  +69 ms] Ignoring terminal input: "R" because we are busy.
[ +140 ms] ChromeProxyService: Initializing expression compiler for main_module.bootstrap.js with sound null safety: false
[  +14 ms] DwdsVmClient: $dartHotRestart request complete.
[        ] DwdsVmClient: Waiting for Isolate Start event.
[   +2 ms] Ignoring terminal input: "R" because we are busy.
[  +27 ms] DwdsVmClient: Successful hot restart
[   +6 ms] Performing hot restart... (completed in 349ms)
[        ] Restarted application in 351ms.
[  +94 ms] Performing hot restart...
[   +2 ms] Skipping target: gen_localizations
[   +2 ms] complete
[  +36 ms] Scanned through 512 files in 32ms
[   +1 ms] Waiting for connection from debug service on Chrome...
[        ] <- recompile org-dartlang-app:/web_entrypoint.dart 86df15c2-e8d2-4516-981a-cca598f71727
[        ] <- 86df15c2-e8d2-4516-981a-cca598f71727
[   +8 ms] Waiting for connection from debug service on Chrome... (completed in 9ms)
[        ] Synced 0.0MB.
[        ] <- accept
[   +1 ms] DwdsVmClient: Attempting a hot restart
[        ] DwdsVmClient: Attempting to disabling breakpoints and resume the isolate
[   +3 ms] DwdsVmClient: Successfully disabled breakpoints and resumed the isolate
[        ] DwdsVmClient: Attempting to get execution context ID.
[        ] DwdsVmClient: Got execution context ID.
[        ] DwdsVmClient: Issuing $dartHotRestart request.
[  +42 ms] ChromeProxyService: Initializing expression compiler for main_module.bootstrap.js with sound null safety: false
[   +5 ms] DwdsVmClient: $dartHotRestart request complete.
[        ] DwdsVmClient: Waiting for Isolate Start event.
[  +24 ms] DwdsVmClient: Successful hot restart
[   +3 ms] Performing hot restart... (completed in 135ms)
[   +1 ms] Restarted application in 137ms.
[   +4 ms] Error: Unexpected null value.
               at Object.throw_ [as throw] (http://localhost:52021/dart_sdk.js:5342:11)
               at Object.nullCheck (http://localhost:52021/dart_sdk.js:5675:30)
               at Object.get skiaFontCollection [as skiaFontCollection] (http://localhost:52021/dart_sdk.js:186049:19)
               at Object._getEffectiveFontFamilies (http://localhost:52021/dart_sdk.js:182611:35)
               at Function.toSkTextStyleProperties (http://localhost:52021/dart_sdk.js:144879:42)
               at Function.toSkParagraphStyle (http://localhost:52021/dart_sdk.js:144928:55)
               at new _engine.CkParagraphStyle.new (http://localhost:52021/dart_sdk.js:144949:55)
               at Function.new (http://localhost:52021/dart_sdk.js:133636:16)
               at DefaultShaderWarmUp.warmUpOnCanvas
               (http://localhost:52021/packages/flutter/src/painting/shader_warm_up.dart.lib.js:242:85)
               at warmUpOnCanvas.next (<anonymous>)
               at runBody (http://localhost:52021/dart_sdk.js:39177:34)
               at Object._async [as async] (http://localhost:52021/dart_sdk.js:39208:7)
               at DefaultShaderWarmUp.warmUpOnCanvas
               (http://localhost:52021/packages/flutter/src/painting/shader_warm_up.dart.lib.js:182:20)
               at DefaultShaderWarmUp.execute
(http://localhost:52021/packages/flutter/src/painting/shader_warm_up.dart.lib.js:116:20)
               at execute.next (<anonymous>)
               at runBody (http://localhost:52021/dart_sdk.js:39177:34)
               at Object._async [as async] (http://localhost:52021/dart_sdk.js:39208:7)
               at DefaultShaderWarmUp.execute
(http://localhost:52021/packages/flutter/src/painting/shader_warm_up.dart.lib.js:113:20)
               at binding$5.WidgetsFlutterBinding.new.initInstances
               (http://localhost:52021/packages/flutter/src/painting/binding.dart.lib.js:75:30)
               at binding$5.WidgetsFlutterBinding.new.initInstances
               (http://localhost:52021/packages/flutter/src/semantics/binding.dart.lib.js:42:13)
               at binding$5.WidgetsFlutterBinding.new.initInstances
               (http://localhost:52021/packages/flutter/src/rendering/layer.dart.lib.js:5934:13)
               at binding$5.WidgetsFlutterBinding.new.initInstances
               (http://localhost:52021/packages/flutter/src/widgets/widget_span.dart.lib.js:51963:13)
               at binding$5.WidgetsFlutterBinding.new.binding.BindingBase.new
               (http://localhost:52021/packages/flutter/src/foundation/binding.dart.lib.js:371:10)
               at binding$5.WidgetsFlutterBinding.new.BindingBase_GestureBinding$36.new
               (http://localhost:52021/packages/flutter/src/widgets/widget_span.dart.lib.js:52540:49)
               at binding$5.WidgetsFlutterBinding.new.BindingBase_SchedulerBinding$36.new
               (http://localhost:52021/packages/flutter/src/widgets/widget_span.dart.lib.js:52546:51)
               at binding$5.WidgetsFlutterBinding.new.BindingBase_ServicesBinding$36.new
               (http://localhost:52021/packages/flutter/src/widgets/widget_span.dart.lib.js:52552:50)
               at binding$5.WidgetsFlutterBinding.new.BindingBase_PaintingBinding$36.new
               (http://localhost:52021/packages/flutter/src/widgets/widget_span.dart.lib.js:52558:50)
               at binding$5.WidgetsFlutterBinding.new.BindingBase_SemanticsBinding$36.new
               (http://localhost:52021/packages/flutter/src/widgets/widget_span.dart.lib.js:52564:51)
               at binding$5.WidgetsFlutterBinding.new.BindingBase_RendererBinding$36.new
               (http://localhost:52021/packages/flutter/src/widgets/widget_span.dart.lib.js:52570:50)
               at binding$5.WidgetsFlutterBinding.new.BindingBase_WidgetsBinding$36.new
               (http://localhost:52021/packages/flutter/src/widgets/widget_span.dart.lib.js:52576:49)
               at new binding$5.WidgetsFlutterBinding.new
               (http://localhost:52021/packages/flutter/src/widgets/widget_span.dart.lib.js:52586:51)
               at Function.ensureInitialized
(http://localhost:52021/packages/flutter/src/widgets/widget_span.dart.lib.js:52581:54)
               at Object.runApp (http://localhost:52021/packages/flutter/src/widgets/widget_span.dart.lib.js:52595:43)
               at main$ (http://localhost:52021/packages/master_flutter/main.dart.lib.js:253:20)
               at main (http://localhost:52021/web_entrypoint.dart.lib.js:46:29)
               at main.next (<anonymous>)
               at http://localhost:52021/dart_sdk.js:39157:33
               at _RootZone.runUnary (http://localhost:52021/dart_sdk.js:39014:58)
               at _FutureListener.thenAwait.handleValue (http://localhost:52021/dart_sdk.js:34000:29)
               at handleValueCallback (http://localhost:52021/dart_sdk.js:34560:49)
               at Function._propagateToListeners (http://localhost:52021/dart_sdk.js:34598:17)
               at _Future.new.[_completeWithValue] (http://localhost:52021/dart_sdk.js:34440:23)
               at http://localhost:52021/dart_sdk.js:33651:46
               at _RootZone.runUnary (http://localhost:52021/dart_sdk.js:39014:58)
               at _FutureListener.then.handleValue (http://localhost:52021/dart_sdk.js:34000:29)
               at handleValueCallback (http://localhost:52021/dart_sdk.js:34560:49)
               at Function._propagateToListeners (http://localhost:52021/dart_sdk.js:34598:17)
               at _Future.new.[_completeWithValue] (http://localhost:52021/dart_sdk.js:34440:23)
               at async._AsyncCallbackEntry.new.callback (http://localhost:52021/dart_sdk.js:34463:35)
               at Object._microtaskLoop (http://localhost:52021/dart_sdk.js:39301:13)
               at _startMicrotaskLoop (http://localhost:52021/dart_sdk.js:39307:13)
               at http://localhost:52021/dart_sdk.js:34814:9
[  +96 ms] Performing hot restart...
[   +2 ms] Skipping target: gen_localizations
[   +7 ms] complete
[  +34 ms] Scanned through 512 files in 33ms
[   +1 ms] Waiting for connection from debug service on Chrome...
[   +1 ms] <- recompile org-dartlang-app:/web_entrypoint.dart 7b87f80f-2036-4fcf-82f2-9f6061b4e076
[        ] <- 7b87f80f-2036-4fcf-82f2-9f6061b4e076
[  +15 ms] ══╡ EXCEPTION CAUGHT BY RENDERING LIBRARY ╞═════════════════════════════════════════════════════════
[   +1 ms] The following TypeErrorImpl was thrown during performLayout():
[   +1 ms] Unexpected null value.
[   +1 ms] The relevant error-causing widget was:
[        ]   Text file:///C:/Users/Taha/AndroidStudioProjects/master_flutter/lib/main.dart:12:18
[        ] When the exception was thrown, this was the stack:
[        ] C:/b/s/w/ir/cache/builder/src/out/host_debug/dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart
236:49
           throw_
[        ]
C:/b/s/w/ir/cache/builder/src/out/host_debug/dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/operations.dart 518:63
           nullCheck
[  +18 ms] C:/b/s/w/ir/cache/builder/src/out/host_debug/flutter_web_sdk/lib/_engine/engine/canvaskit/initialization.dart 109:65           get skiaFontCollection
[   +1 ms] C:/b/s/w/ir/cache/builder/src/out/host_debug/flutter_web_sdk/lib/_engine/engine/canvaskit/text.dart 872:42
           _getEffectiveFontFamilies
[  +10 ms] C:/b/s/w/ir/cache/builder/src/out/host_debug/flutter_web_sdk/lib/_engine/engine/canvaskit/text.dart 65:32
           toSkTextStyleProperties
[   +7 ms] C:/b/s/w/ir/cache/builder/src/out/host_debug/flutter_web_sdk/lib/_engine/engine/canvaskit/text.dart 147:9
           toSkParagraphStyle
[   +1 ms] C:/b/s/w/ir/cache/builder/src/out/host_debug/flutter_web_sdk/lib/_engine/engine/canvaskit/text.dart 23:28
           new
[   +1 ms] C:/b/s/w/ir/cache/builder/src/out/host_debug/flutter_web_sdk/lib/ui/src/ui/text.dart 334:21
           new
[   +1 ms] packages/flutter/src/painting/text_style.dart 1089:15
           getParagraphStyle
[        ] packages/flutter/src/painting/text_painter.dart 416:26
           [_createParagraphStyle]
[  +22 ms] packages/flutter/src/painting/text_painter.dart 568:63
           layout
[  +15 ms] packages/flutter/src/rendering/paragraph.dart 515:18
           [_layoutText]
[   +8 ms] packages/flutter/src/rendering/paragraph.dart 538:5
           [_layoutTextWithConstraints]
[   +1 ms] packages/flutter/src/rendering/paragraph.dart 651:5
           performLayout
[  +15 ms] packages/flutter/src/rendering/object.dart 1784:7
           layout
[  +19 ms] packages/flutter/src/material/app_bar.dart 1867:5
           performLayout
[  +24 ms] packages/flutter/src/rendering/object.dart 1784:7
           layout
[   +1 ms] packages/flutter/src/rendering/proxy_box.dart 118:7
           performLayout
[   +8 ms] packages/flutter/src/rendering/object.dart 1784:7
           layout
[   +2 ms] packages/flutter/src/rendering/custom_layout.dart 171:10
           layoutChild
[   +1 ms] packages/flutter/src/widgets/navigation_toolbar.dart 148:31
           performLayout
[   +1 ms] packages/flutter/src/rendering/custom_layout.dart 243:7
           [_callPerformLayout]
[   +6 ms] packages/flutter/src/rendering/custom_layout.dart 407:14
           performLayout
[   +1 ms] packages/flutter/src/rendering/object.dart 1784:7
           layout
[  +14 ms] packages/flutter/src/rendering/shifted_box.dart 1224:7
           performLayout
[   +4 ms] packages/flutter/src/rendering/object.dart 1784:7
           layout
[   +6 ms] packages/flutter/src/rendering/proxy_box.dart 118:7
           performLayout
[   +6 ms] packages/flutter/src/rendering/proxy_box.dart 1371:11
           performLayout
[   +7 ms] packages/flutter/src/rendering/object.dart 1784:7
           layout
[   +7 ms] packages/flutter/src/rendering/shifted_box.dart 226:5
           performLayout
[   +2 ms] packages/flutter/src/rendering/object.dart 1784:7
           layout
[   +1 ms] packages/flutter/src/rendering/shifted_box.dart 430:7
           performLayout
[   +1 ms] packages/flutter/src/rendering/object.dart 1784:7
           layout
[   +1 ms] packages/flutter/src/rendering/proxy_box.dart 118:7
           performLayout
[   +6 ms] packages/flutter/src/rendering/object.dart 1784:7
           layout
[   +1 ms] packages/flutter/src/rendering/proxy_box.dart 118:7
           performLayout
[   +6 ms] packages/flutter/src/rendering/object.dart 1784:7
           layout
[   +5 ms] packages/flutter/src/rendering/proxy_box.dart 118:7
           performLayout
[   +1 ms] packages/flutter/src/rendering/proxy_box.dart 1371:11
           performLayout
[   +6 ms] packages/flutter/src/rendering/object.dart 1784:7
           layout
[   +6 ms] packages/flutter/src/rendering/proxy_box.dart 118:7
           performLayout
[   +6 ms] packages/flutter/src/rendering/object.dart 1784:7
           layout
[   +1 ms] packages/flutter/src/rendering/proxy_box.dart 118:7
           performLayout
[   +5 ms] packages/flutter/src/rendering/object.dart 1784:7
           layout
[   +6 ms] packages/flutter/src/rendering/proxy_box.dart 279:7
           performLayout
[   +1 ms] packages/flutter/src/rendering/object.dart 1784:7
           layout
[   +6 ms] packages/flutter/src/rendering/custom_layout.dart 171:10
           layoutChild
[   +6 ms] packages/flutter/src/material/scaffold.dart 880:78
           performLayout
[   +6 ms] packages/flutter/src/rendering/custom_layout.dart 243:7
           [_callPerformLayout]
[   +1 ms] packages/flutter/src/rendering/custom_layout.dart 407:14
           performLayout
[   +5 ms] packages/flutter/src/rendering/object.dart 1784:7
           layout
[   +7 ms] packages/flutter/src/rendering/proxy_box.dart 118:7
           performLayout
[   +6 ms] packages/flutter/src/rendering/object.dart 1784:7
           layout
[   +7 ms] packages/flutter/src/rendering/proxy_box.dart 118:7
           performLayout
[   +7 ms] packages/flutter/src/rendering/proxy_box.dart 1371:11
           performLayout
[   +6 ms] packages/flutter/src/rendering/object.dart 1784:7
           layout
[   +9 ms] packages/flutter/src/rendering/proxy_box.dart 118:7
           performLayout
[  +17 ms] packages/flutter/src/rendering/object.dart 1784:7
           layout
[   +2 ms] packages/flutter/src/rendering/proxy_box.dart 118:7
           performLayout
[   +2 ms] packages/flutter/src/rendering/object.dart 1784:7
           layout
[   +1 ms] packages/flutter/src/rendering/proxy_box.dart 118:7
           performLayout
[   +7 ms] packages/flutter/src/rendering/object.dart 1784:7
           layout
[   +7 ms] packages/flutter/src/rendering/proxy_box.dart 118:7
           performLayout
[   +2 ms] packages/flutter/src/rendering/object.dart 1784:7
           layout
[   +1 ms] packages/flutter/src/rendering/proxy_box.dart 118:7
           performLayout
[   +1 ms] packages/flutter/src/rendering/object.dart 1784:7
           layout
[   +1 ms] packages/flutter/src/rendering/proxy_box.dart 118:7
           performLayout
[   +6 ms] packages/flutter/src/rendering/object.dart 1784:7
           layout
[   +6 ms] packages/flutter/src/rendering/proxy_box.dart 118:7
           performLayout
[   +1 ms] packages/flutter/src/rendering/object.dart 1784:7
           layout
[   +6 ms] packages/flutter/src/rendering/proxy_box.dart 118:7
           performLayout
[   +7 ms] packages/flutter/src/rendering/proxy_box.dart 3362:13
           performLayout
[   +6 ms] packages/flutter/src/rendering/object.dart 1784:7
           layout
[   +7 ms] packages/flutter/src/rendering/proxy_box.dart 118:7
           performLayout
[   +5 ms] packages/flutter/src/rendering/object.dart 1784:7
           layout
[   +6 ms] packages/flutter/src/widgets/overlay.dart 743:14
           performLayout
[   +1 ms] packages/flutter/src/rendering/object.dart 1784:7
           layout
[   +6 ms] packages/flutter/src/rendering/proxy_box.dart 118:7
           performLayout
[   +7 ms] packages/flutter/src/rendering/object.dart 1784:7
           layout
[   +5 ms] packages/flutter/src/rendering/proxy_box.dart 118:7
           performLayout
[   +6 ms] packages/flutter/src/rendering/object.dart 1784:7
           layout
[   +1 ms] packages/flutter/src/rendering/proxy_box.dart 118:7
           performLayout
[   +6 ms] packages/flutter/src/rendering/object.dart 1784:7
           layout
[   +7 ms] packages/flutter/src/rendering/proxy_box.dart 118:7
           performLayout
[   +5 ms] packages/flutter/src/rendering/custom_paint.dart 546:11
           performLayout
[   +7 ms] packages/flutter/src/rendering/object.dart 1784:7
           layout
[   +1 ms] packages/flutter/src/rendering/proxy_box.dart 118:7
           performLayout
[   +8 ms] Ignoring terminal input: "R" because we are busy.
[   +7 ms] Ignoring terminal input: "RRR" because we are busy.
[   +8 ms] Waiting for connection from debug service on Chrome... (completed in 562ms)
[   +1 ms] Synced 0.0MB.
[        ] <- accept
[        ] DwdsVmClient: Attempting a hot restart
[   +6 ms] DwdsVmClient: Attempting to disabling breakpoints and resume the isolate
[   +6 ms] DwdsVmClient: Successfully disabled breakpoints and resumed the isolate
[   +1 ms] DwdsVmClient: Attempting to get execution context ID.
[   +1 ms] DwdsVmClient: Got execution context ID.
[   +1 ms] DwdsVmClient: Issuing $dartHotRestart request.
[  +30 ms] ChromeProxyService: Initializing expression compiler for main_module.bootstrap.js with sound null safety: false
[   +6 ms] DwdsVmClient: $dartHotRestart request complete.
[   +4 ms] DwdsVmClient: Waiting for Isolate Start event.
[   +1 ms] Ignoring terminal input: "R" because we are busy.
[   +1 ms] DwdsVmClient: Successful hot restart
[   +1 ms] Performing hot restart... (completed in 674ms)
[  +16 ms] Restarted application in 692ms.
[ +131 ms] Performing hot restart...
[   +2 ms] Skipping target: gen_localizations
[   +2 ms] complete
[  +37 ms] Scanned through 512 files in 32ms
[   +1 ms] Waiting for connection from debug service on Chrome...
[   +1 ms] <- recompile org-dartlang-app:/web_entrypoint.dart 84c7ca93-5592-460b-b63c-23236a955018
[   +6 ms] <- 84c7ca93-5592-460b-b63c-23236a955018
[  +34 ms] Waiting for connection from debug service on Chrome... (completed in 41ms)
[        ] Synced 0.0MB.
[        ] <- accept
[   +6 ms] DwdsVmClient: Attempting a hot restart
[   +1 ms] DwdsVmClient: Attempting to disabling breakpoints and resume the isolate
[   +2 ms] DwdsVmClient: Successfully disabled breakpoints and resumed the isolate
[        ] DwdsVmClient: Attempting to get execution context ID.
[        ] DwdsVmClient: Got execution context ID.
[        ] DwdsVmClient: Issuing $dartHotRestart request.
[  +36 ms] Ignoring terminal input: "R" because we are busy.
[  +96 ms] ChromeProxyService: Initializing expression compiler for main_module.bootstrap.js with sound null safety: false
[   +5 ms] DwdsVmClient: $dartHotRestart request complete.
[   +3 ms] DwdsVmClient: Waiting for Isolate Start event.
[   +1 ms] DwdsVmClient: Successful hot restart
[   +1 ms] Performing hot restart... (completed in 244ms)
[   +1 ms] Restarted application in 246ms.
[  +64 ms] Performing hot restart...
[   +1 ms] Skipping target: gen_localizations
[   +2 ms] complete
[  +37 ms] Scanned through 512 files in 36ms
[   +1 ms] Waiting for connection from debug service on Chrome...
[   +1 ms] <- recompile org-dartlang-app:/web_entrypoint.dart dddc2051-12cc-4dc7-ac3a-3821d6c468c2
[        ] <- dddc2051-12cc-4dc7-ac3a-3821d6c468c2
[   +9 ms] Waiting for connection from debug service on Chrome... (completed in 10ms)
[   +3 ms] Synced 0.0MB.
[        ] <- accept
[        ] DwdsVmClient: Attempting a hot restart
[        ] DwdsVmClient: Attempting to disabling breakpoints and resume the isolate
[   +2 ms] DwdsVmClient: Successfully disabled breakpoints and resumed the isolate
[   +6 ms] DwdsVmClient: Attempting to get execution context ID.
[        ] DwdsVmClient: Got execution context ID.
[   +5 ms] DwdsVmClient: Issuing $dartHotRestart request.
[  +42 ms] ChromeProxyService: Initializing expression compiler for main_module.bootstrap.js with sound null safety: false
[   +5 ms] DwdsVmClient: $dartHotRestart request complete.
[   +1 ms] DwdsVmClient: Waiting for Isolate Start event.
[  +18 ms] DwdsVmClient: Successful hot restart
[        ] Performing hot restart... (completed in 142ms)
[        ] Restarted application in 144ms.
[   +9 ms] Error: Unexpected null value.
               at Object.throw_ [as throw] (http://localhost:52021/dart_sdk.js:5342:11)
               at Object.nullCheck (http://localhost:52021/dart_sdk.js:5675:30)
               at Object.get skiaFontCollection [as skiaFontCollection] (http://localhost:52021/dart_sdk.js:186049:19)
               at Object._getEffectiveFontFamilies (http://localhost:52021/dart_sdk.js:182611:35)
               at Function.toSkTextStyleProperties (http://localhost:52021/dart_sdk.js:144879:42)
               at Function.toSkParagraphStyle (http://localhost:52021/dart_sdk.js:144928:55)
               at new _engine.CkParagraphStyle.new (http://localhost:52021/dart_sdk.js:144949:55)
               at Function.new (http://localhost:52021/dart_sdk.js:133636:16)
               at DefaultShaderWarmUp.warmUpOnCanvas
               (http://localhost:52021/packages/flutter/src/painting/shader_warm_up.dart.lib.js:242:85)
               at warmUpOnCanvas.next (<anonymous>)
               at runBody (http://localhost:52021/dart_sdk.js:39177:34)
               at Object._async [as async] (http://localhost:52021/dart_sdk.js:39208:7)
               at DefaultShaderWarmUp.warmUpOnCanvas
               (http://localhost:52021/packages/flutter/src/painting/shader_warm_up.dart.lib.js:182:20)
               at DefaultShaderWarmUp.execute
(http://localhost:52021/packages/flutter/src/painting/shader_warm_up.dart.lib.js:116:20)
               at execute.next (<anonymous>)
               at runBody (http://localhost:52021/dart_sdk.js:39177:34)
               at Object._async [as async] (http://localhost:52021/dart_sdk.js:39208:7)
               at DefaultShaderWarmUp.execute
(http://localhost:52021/packages/flutter/src/painting/shader_warm_up.dart.lib.js:113:20)
               at binding$5.WidgetsFlutterBinding.new.initInstances
               (http://localhost:52021/packages/flutter/src/painting/binding.dart.lib.js:75:30)
               at binding$5.WidgetsFlutterBinding.new.initInstances
               (http://localhost:52021/packages/flutter/src/semantics/binding.dart.lib.js:42:13)
               at binding$5.WidgetsFlutterBinding.new.initInstances
               (http://localhost:52021/packages/flutter/src/rendering/layer.dart.lib.js:5934:13)
               at binding$5.WidgetsFlutterBinding.new.initInstances
               (http://localhost:52021/packages/flutter/src/widgets/widget_span.dart.lib.js:51963:13)
               at binding$5.WidgetsFlutterBinding.new.binding.BindingBase.new
               (http://localhost:52021/packages/flutter/src/foundation/binding.dart.lib.js:371:10)
               at binding$5.WidgetsFlutterBinding.new.BindingBase_GestureBinding$36.new
               (http://localhost:52021/packages/flutter/src/widgets/widget_span.dart.lib.js:52540:49)
               at binding$5.WidgetsFlutterBinding.new.BindingBase_SchedulerBinding$36.new
               (http://localhost:52021/packages/flutter/src/widgets/widget_span.dart.lib.js:52546:51)
               at binding$5.WidgetsFlutterBinding.new.BindingBase_ServicesBinding$36.new
               (http://localhost:52021/packages/flutter/src/widgets/widget_span.dart.lib.js:52552:50)
               at binding$5.WidgetsFlutterBinding.new.BindingBase_PaintingBinding$36.new
               (http://localhost:52021/packages/flutter/src/widgets/widget_span.dart.lib.js:52558:50)
               at binding$5.WidgetsFlutterBinding.new.BindingBase_SemanticsBinding$36.new
               (http://localhost:52021/packages/flutter/src/widgets/widget_span.dart.lib.js:52564:51)
               at binding$5.WidgetsFlutterBinding.new.BindingBase_RendererBinding$36.new
               (http://localhost:52021/packages/flutter/src/widgets/widget_span.dart.lib.js:52570:50)
               at binding$5.WidgetsFlutterBinding.new.BindingBase_WidgetsBinding$36.new
               (http://localhost:52021/packages/flutter/src/widgets/widget_span.dart.lib.js:52576:49)
               at new binding$5.WidgetsFlutterBinding.new
               (http://localhost:52021/packages/flutter/src/widgets/widget_span.dart.lib.js:52586:51)
               at Function.ensureInitialized
(http://localhost:52021/packages/flutter/src/widgets/widget_span.dart.lib.js:52581:54)
               at Object.runApp (http://localhost:52021/packages/flutter/src/widgets/widget_span.dart.lib.js:52595:43)
               at main$ (http://localhost:52021/packages/master_flutter/main.dart.lib.js:253:20)
               at main (http://localhost:52021/web_entrypoint.dart.lib.js:46:29)
               at main.next (<anonymous>)
               at http://localhost:52021/dart_sdk.js:39157:33
               at _RootZone.runUnary (http://localhost:52021/dart_sdk.js:39014:58)
               at _FutureListener.thenAwait.handleValue (http://localhost:52021/dart_sdk.js:34000:29)
               at handleValueCallback (http://localhost:52021/dart_sdk.js:34560:49)
               at Function._propagateToListeners (http://localhost:52021/dart_sdk.js:34598:17)
               at _Future.new.[_completeWithValue] (http://localhost:52021/dart_sdk.js:34440:23)
               at http://localhost:52021/dart_sdk.js:33651:46
               at _RootZone.runUnary (http://localhost:52021/dart_sdk.js:39014:58)
               at _FutureListener.then.handleValue (http://localhost:52021/dart_sdk.js:34000:29)
               at handleValueCallback (http://localhost:52021/dart_sdk.js:34560:49)
               at Function._propagateToListeners (http://localhost:52021/dart_sdk.js:34598:17)
               at _Future.new.[_completeWithValue] (http://localhost:52021/dart_sdk.js:34440:23)
               at async._AsyncCallbackEntry.new.callback (http://localhost:52021/dart_sdk.js:34463:35)
               at Object._microtaskLoop (http://localhost:52021/dart_sdk.js:39301:13)
               at _startMicrotaskLoop (http://localhost:52021/dart_sdk.js:39307:13)
               at http://localhost:52021/dart_sdk.js:34814:9
[  +62 ms] Performing hot restart...
[   +8 ms] Skipping target: gen_localizations
[   +9 ms] complete
[  +34 ms] Scanned through 512 files in 33ms
[        ] Waiting for connection from debug service on Chrome...
[        ] <- recompile org-dartlang-app:/web_entrypoint.dart faccb3da-c3d8-448c-8ee0-9097b4e1b23a
[        ] <- faccb3da-c3d8-448c-8ee0-9097b4e1b23a
[  +22 ms] ══╡ EXCEPTION CAUGHT BY RENDERING LIBRARY ╞═════════════════════════════════════════════════════════
[   +1 ms] The following TypeErrorImpl was thrown during performLayout():
[   +1 ms] Unexpected null value.
[   +1 ms] The relevant error-causing widget was:
[        ]   Text file:///C:/Users/Taha/AndroidStudioProjects/master_flutter/lib/main.dart:12:18
[        ] When the exception was thrown, this was the stack:
[  +16 ms] C:/b/s/w/ir/cache/builder/src/out/host_debug/dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart
236:49
           throw_
[   +7 ms]
C:/b/s/w/ir/cache/builder/src/out/host_debug/dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/operations.dart 518:63
           nullCheck
[   +1 ms] C:/b/s/w/ir/cache/builder/src/out/host_debug/flutter_web_sdk/lib/_engine/engine/canvaskit/initialization.dart 109:65           get skiaFontCollection
[   +1 ms] C:/b/s/w/ir/cache/builder/src/out/host_debug/flutter_web_sdk/lib/_engine/engine/canvaskit/text.dart 872:42
           _getEffectiveFontFamilies
[   +9 ms] C:/b/s/w/ir/cache/builder/src/out/host_debug/flutter_web_sdk/lib/_engine/engine/canvaskit/text.dart 65:32
           toSkTextStyleProperties
[   +1 ms] C:/b/s/w/ir/cache/builder/src/out/host_debug/flutter_web_sdk/lib/_engine/engine/canvaskit/text.dart 147:9
           toSkParagraphStyle
[   +1 ms] C:/b/s/w/ir/cache/builder/src/out/host_debug/flutter_web_sdk/lib/_engine/engine/canvaskit/text.dart 23:28
           new
[   +1 ms] C:/b/s/w/ir/cache/builder/src/out/host_debug/flutter_web_sdk/lib/ui/src/ui/text.dart 334:21
           new
[  +21 ms] packages/flutter/src/painting/text_style.dart 1089:15
           getParagraphStyle
[  +20 ms] packages/flutter/src/painting/text_painter.dart 416:26
           [_createParagraphStyle]
[   +4 ms] packages/flutter/src/painting/text_painter.dart 568:63
           layout
[  +11 ms] packages/flutter/src/rendering/paragraph.dart 515:18
           [_layoutText]
[  +21 ms] packages/flutter/src/rendering/paragraph.dart 538:5
           [_layoutTextWithConstraints]
[   +1 ms] packages/flutter/src/rendering/paragraph.dart 651:5
           performLayout
[   +1 ms] packages/flutter/src/rendering/object.dart 1784:7
           layout
[  +28 ms] packages/flutter/src/material/app_bar.dart 1867:5
           performLayout
[  +10 ms] packages/flutter/src/rendering/object.dart 1784:7
           layout
[   +1 ms] packages/flutter/src/rendering/proxy_box.dart 118:7
           performLayout
[   +5 ms] packages/flutter/src/rendering/object.dart 1784:7
           layout
[   +1 ms] packages/flutter/src/rendering/custom_layout.dart 171:10
           layoutChild
[  +13 ms] packages/flutter/src/widgets/navigation_toolbar.dart 148:31
           performLayout
[   +7 ms] packages/flutter/src/rendering/custom_layout.dart 243:7
           [_callPerformLayout]
[   +6 ms] packages/flutter/src/rendering/custom_layout.dart 407:14
           performLayout
[   +7 ms] packages/flutter/src/rendering/object.dart 1784:7
           layout
[   +6 ms] packages/flutter/src/rendering/shifted_box.dart 1224:7
           performLayout
[   +7 ms] packages/flutter/src/rendering/object.dart 1784:7
           layout
[   +6 ms] packages/flutter/src/rendering/proxy_box.dart 118:7
           performLayout
[  +13 ms] packages/flutter/src/rendering/proxy_box.dart 1371:11
           performLayout
[   +4 ms] packages/flutter/src/rendering/object.dart 1784:7
           layout
[   +1 ms] packages/flutter/src/rendering/shifted_box.dart 226:5
           performLayout
[   +1 ms] packages/flutter/src/rendering/object.dart 1784:7
           layout
[  +21 ms] packages/flutter/src/rendering/shifted_box.dart 430:7
           performLayout
[   +2 ms] Ignoring terminal input: "R" because we are busy.
[  +18 ms] packages/flutter/src/rendering/object.dart 1784:7
           layout
[   +1 ms] packages/flutter/src/rendering/proxy_box.dart 118:7
           performLayout
[   +1 ms] packages/flutter/src/rendering/object.dart 1784:7
           layout
[        ] packages/flutter/src/rendering/proxy_box.dart 118:7
           performLayout
[        ] packages/flutter/src/rendering/object.dart 1784:7
           layout
[        ] packages/flutter/src/rendering/proxy_box.dart 118:7
           performLayout
[        ] packages/flutter/src/rendering/proxy_box.dart 1371:11
           performLayout
[        ] packages/flutter/src/rendering/object.dart 1784:7
           layout
[   +6 ms] packages/flutter/src/rendering/proxy_box.dart 118:7
           performLayout
[   +1 ms] packages/flutter/src/rendering/object.dart 1784:7
           layout
[   +7 ms] packages/flutter/src/rendering/proxy_box.dart 118:7
           performLayout
[   +6 ms] packages/flutter/src/rendering/object.dart 1784:7
           layout
[   +2 ms] packages/flutter/src/rendering/proxy_box.dart 279:7
           performLayout
[   +1 ms] packages/flutter/src/rendering/object.dart 1784:7
           layout
[        ] packages/flutter/src/rendering/custom_layout.dart 171:10
           layoutChild
[        ] packages/flutter/src/material/scaffold.dart 880:78
           performLayout
[        ] packages/flutter/src/rendering/custom_layout.dart 243:7
           [_callPerformLayout]
[   +6 ms] packages/flutter/src/rendering/custom_layout.dart 407:14
           performLayout
[        ] packages/flutter/src/rendering/object.dart 1784:7
           layout
[   +5 ms] packages/flutter/src/rendering/proxy_box.dart 118:7
           performLayout
[   +1 ms] packages/flutter/src/rendering/object.dart 1784:7
           layout
[   +5 ms] packages/flutter/src/rendering/proxy_box.dart 118:7
           performLayout
[   +1 ms] packages/flutter/src/rendering/proxy_box.dart 1371:11
           performLayout
[   +5 ms] packages/flutter/src/rendering/object.dart 1784:7
           layout
[   +7 ms] packages/flutter/src/rendering/proxy_box.dart 118:7
           performLayout
[   +6 ms] packages/flutter/src/rendering/object.dart 1784:7
           layout
[   +6 ms] packages/flutter/src/rendering/proxy_box.dart 118:7
           performLayout
[   +6 ms] packages/flutter/src/rendering/object.dart 1784:7
           layout
[   +7 ms] packages/flutter/src/rendering/proxy_box.dart 118:7
           performLayout
[   +6 ms] packages/flutter/src/rendering/object.dart 1784:7
           layout
[   +2 ms] packages/flutter/src/rendering/proxy_box.dart 118:7
           performLayout
[   +5 ms] packages/flutter/src/rendering/object.dart 1784:7
           layout
[   +6 ms] packages/flutter/src/rendering/proxy_box.dart 118:7
           performLayout
[   +6 ms] packages/flutter/src/rendering/object.dart 1784:7
           layout
[   +6 ms] packages/flutter/src/rendering/proxy_box.dart 118:7
           performLayout
[   +1 ms] packages/flutter/src/rendering/object.dart 1784:7
           layout
[   +5 ms] packages/flutter/src/rendering/proxy_box.dart 118:7
           performLayout
[   +6 ms] packages/flutter/src/rendering/object.dart 1784:7
           layout
[   +1 ms] packages/flutter/src/rendering/proxy_box.dart 118:7
           performLayout
[   +5 ms] packages/flutter/src/rendering/proxy_box.dart 3362:13
           performLayout
[   +7 ms] packages/flutter/src/rendering/object.dart 1784:7
           layout
[   +6 ms] packages/flutter/src/rendering/proxy_box.dart 118:7
           performLayout
[   +7 ms] packages/flutter/src/rendering/object.dart 1784:7
           layout
[   +6 ms] packages/flutter/src/widgets/overlay.dart 743:14
           performLayout
[   +7 ms] packages/flutter/src/rendering/object.dart 1784:7
           layout
[   +6 ms] packages/flutter/src/rendering/proxy_box.dart 118:7
           performLayout
[   +6 ms] packages/flutter/src/rendering/object.dart 1784:7
           layout
[   +7 ms] packages/flutter/src/rendering/proxy_box.dart 118:7
           performLayout
[   +6 ms] packages/flutter/src/rendering/object.dart 1784:7
           layout
[   +2 ms] packages/flutter/src/rendering/proxy_box.dart 118:7
           performLayout
[   +1 ms] packages/flutter/src/rendering/object.dart 1784:7
           layout
[        ] packages/flutter/src/rendering/proxy_box.dart 118:7
           performLayout
[        ] packages/flutter/src/rendering/custom_paint.dart 546:11
           performLayout
[        ] packages/flutter/src/rendering/object.dart 1784:7
           layout
[        ] packages/flutter/src/rendering/proxy_box.dart 118:7
           performLayout
[  +23 ms] Waiting for connection from debug service on Chrome... (completed in 565ms)
[   +3 ms] Synced 0.0MB.
[   +2 ms] <- accept
[        ] DwdsVmClient: Attempting a hot restart
[   +1 ms] DwdsVmClient: Attempting to disabling breakpoints and resume the isolate
[   +2 ms] DwdsVmClient: Successfully disabled breakpoints and resumed the isolate
[   +6 ms] DwdsVmClient: Attempting to get execution context ID.
[        ] DwdsVmClient: Got execution context ID.
[   +5 ms] DwdsVmClient: Issuing $dartHotRestart request.
[  +30 ms] ChromeProxyService: Initializing expression compiler for main_module.bootstrap.js with sound null safety: false
[  +10 ms] DwdsVmClient: $dartHotRestart request complete.
[   +1 ms] DwdsVmClient: Waiting for Isolate Start event.
[   +3 ms] DwdsVmClient: Successful hot restart
[   +1 ms] Performing hot restart... (completed in 683ms)
[        ] Restarted application in 692ms.

flutter doctor -v
[✓] Flutter (Channel beta, 1.26.0-17.3.pre, on macOS 11.2 20D64 darwin-x64, locale en-GB)
    • Flutter version 1.26.0-17.3.pre at /Users/tahatesser/Code/flutter_beta
    • Framework revision 4b50ca7f7f (5 days ago), 2021-02-04 19:44:27 -0800
    • Engine revision 2c527d6c7e
    • Dart version 2.12.0 (build 2.12.0-259.8.beta)
[✗] Android toolchain - develop for Android devices
    ✗ Unable to locate Android SDK.
      Install Android Studio from: https://developer.android.com/studio/index.html
      On first launch it will assist you in installing the Android SDK components.
      (or visit https://flutter.dev/docs/get-started/install/macos#android-setup for detailed instructions).
      If the Android SDK has been installed to a custom location, please use
      `flutter config --android-sdk` to update to that location.
[!] Xcode - develop for iOS and macOS
    • Xcode at /Volumes/Extreme/Xcode.app/Contents/Developer
    • Xcode 12.4, Build version 12D4e
    ✗ CocoaPods not installed.
        CocoaPods is used to retrieve the iOS and macOS platform side's plugin code that responds to your plugin usage on the Dart side.
        Without CocoaPods, plugins will not work on iOS or macOS.
        For more info, see https://flutter.dev/platform-plugins
      To install see https://guides.cocoapods.org/using/getting-started.html#installation for instructions.
[✓] Chrome - develop for the web
    • Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome
[✓] Android Studio (version 4.1)
    • Android Studio at /Applications/Android Studio.app/Contents
    • Flutter plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/9212-flutter
    • Dart plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/6351-dart
    • Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b3-6915495)
[✓] VS Code (version 1.53.1)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension version 3.19.0
[✓] Connected device (2 available)
    • Taha’s iPad (mobile) • 00008020-000255113EE8402E • ios            • iOS 14.4
    • Chrome (web)         • chrome                    • web-javascript • Google Chrome 88.0.4324.150
! Doctor found issues in 2 categories.

[✓] Flutter (Channel dev, 1.26.0-17.2.pre, on macOS 11.2 20D64 darwin-x64, locale en-GB)
    • Flutter version 1.26.0-17.2.pre at /Users/tahatesser/Code/flutter_dev
    • Framework revision 79b49b9e10 (6 days ago), 2021-02-03 15:33:39 -0800
    • Engine revision 2c527d6c7e
    • Dart version 2.12.0 (build 2.12.0-259.8.beta)
[✗] Android toolchain - develop for Android devices
    ✗ Unable to locate Android SDK.
      Install Android Studio from: https://developer.android.com/studio/index.html
      On first launch it will assist you in installing the Android SDK components.
      (or visit https://flutter.dev/docs/get-started/install/macos#android-setup for detailed instructions).
      If the Android SDK has been installed to a custom location, please use
      `flutter config --android-sdk` to update to that location.
[!] Xcode - develop for iOS and macOS
    • Xcode at /Volumes/Extreme/Xcode.app/Contents/Developer
    • Xcode 12.4, Build version 12D4e
    ✗ CocoaPods not installed.
        CocoaPods is used to retrieve the iOS and macOS platform side's plugin code that responds to your plugin usage on the Dart side.
        Without CocoaPods, plugins will not work on iOS or macOS.
        For more info, see https://flutter.dev/platform-plugins
      To install see https://guides.cocoapods.org/using/getting-started.html#installation for instructions.
[✓] Chrome - develop for the web
    • Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome
[✓] Android Studio (version 4.1)
    • Android Studio at /Applications/Android Studio.app/Contents
    • Flutter plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/9212-flutter
    • Dart plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/6351-dart
    • Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b3-6915495)
[✓] VS Code (version 1.53.1)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension version 3.19.0
[✓] Connected device (3 available)
    • Taha’s iPad (mobile) • 00008020-000255113EE8402E • ios            • iOS 14.4
    • macOS (desktop)      • macos                     • darwin-x64     • macOS 11.2 20D64 darwin-x64
    • Chrome (web)         • chrome                    • web-javascript • Google Chrome 88.0.4324.150
! Doctor found issues in 2 categories.

[✓] Flutter (Channel master, 1.26.0-18.0.pre.255, on macOS 11.2 20D64 darwin-x64, locale en-GB)
    • Flutter version 1.26.0-18.0.pre.255 at /Users/tahatesser/Code/flutter_master
    • Framework revision 278065284d (8 hours ago), 2021-02-09 17:51:03 -0800
    • Engine revision b3a18f5182
    • Dart version 2.13.0 (build 2.13.0-15.0.dev)
[✗] Android toolchain - develop for Android devices
    ✗ Unable to locate Android SDK.
      Install Android Studio from: https://developer.android.com/studio/index.html
      On first launch it will assist you in installing the Android SDK components.
      (or visit https://flutter.dev/docs/get-started/install/macos#android-setup for detailed instructions).
      If the Android SDK has been installed to a custom location, please use
      `flutter config --android-sdk` to update to that location.
[!] Xcode - develop for iOS and macOS
    • Xcode at /Volumes/Extreme/Xcode.app/Contents/Developer
    • Xcode 12.4, Build version 12D4e
    ✗ CocoaPods not installed.
        CocoaPods is used to retrieve the iOS and macOS platform side's plugin code that responds to your plugin usage on the Dart side.
        Without CocoaPods, plugins will not work on iOS or macOS.
        For more info, see https://flutter.dev/platform-plugins
      To install see https://guides.cocoapods.org/using/getting-started.html#installation for instructions.
[✓] Chrome - develop for the web
    • Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome
[✓] Android Studio (version 4.1)
    • Android Studio at /Applications/Android Studio.app/Contents
    • Flutter plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/9212-flutter
    • Dart plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/6351-dart
    • Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b3-6915495)
[✓] VS Code (version 1.53.1)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension version 3.19.0
[✓] Connected device (3 available)
    • Taha’s iPad (mobile) • 00008020-000255113EE8402E • ios            • iOS 14.4
    • macOS (desktop)      • macos                     • darwin-x64     • macOS 11.2 20D64 darwin-x64
    • Chrome (web)         • chrome                    • web-javascript • Google Chrome 88.0.4324.150
! Doctor found issues in 2 categories.

Thanks for filing the issue

can you please fix it fast

Reproducible when hot-reload and hot-restart from VS Code, Android Studio, Terminal due to https://github.com/flutter/flutter/issues/75630, also reproduces on 1.27

logs

════════ Exception caught by rendering library ═════════════════════════════════
The following TypeErrorImpl was thrown during performLayout():
Unexpected null value.

The relevant error-causing widget was
Text
 lib/main.dart
When the exception was thrown, this was the stack
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 236:49      throw_
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/operations.dart 518:63  nullCheck
lib/_engine/engine/canvaskit/initialization.dart 109:65                           get skiaFontCollection
lib/_engine/engine/canvaskit/text.dart 869:42                                     _getEffectiveFontFamilies
lib/_engine/engine/canvaskit/text.dart 65:32                                      toSkTextStyleProperties
...
The following RenderObject was being processed when the exception was fired: RenderParagraph#bb575 relayoutBoundary=up14 NEEDS-LAYOUT NEEDS-PAINT
RenderObject: RenderParagraph#bb575 relayoutBoundary=up14 NEEDS-LAYOUT NEEDS-PAINT
    parentData: offset=Offset(0.0, 0.0) (can use size)
    constraints: BoxConstraints(0.0<=w<=1168.0, 0.0<=h<=Infinity)
    size: MISSING
    textAlign: start
    textDirection: ltr
    softWrap: no wrapping except at line break characters
    overflow: ellipsis
    locale: en_US
    maxLines: unlimited
    text: TextSpan
        debugLabel: (englishLike title 2014).merge(whiteRedwoodCity headline6)
        inherit: false
        color: Color(0xffffffff)
        family: .AppleSystemUIFont
        size: 20.0
        weight: 500
        baseline: alphabetic
        decoration: TextDecoration.none
        "Material App Bar"
════════════════════════════════════════════════════════════════════════════════

════════ Exception caught by rendering library ═════════════════════════════════
Assertion failed:
 ../…/rendering/box.dart
hasSize
"RenderBox was not laid out: RenderParagraph#bb575 relayoutBoundary=up14 NEEDS-PAINT"

The relevant error-causing widget was
AppBar
 lib/main.dart
════════════════════════════════════════════════════════════════════════════════

════════ Exception caught by rendering library ═════════════════════════════════
Assertion failed:
 ../…/rendering/box.dart
hasSize
"RenderBox was not laid out: _RenderAppBarTitleBox#f8399 relayoutBoundary=up13 NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE"

The relevant error-causing widget was
AppBar
 lib/main.dart
════════════════════════════════════════════════════════════════════════════════

════════ Exception caught by rendering library ═════════════════════════════════
Assertion failed:
 ../…/rendering/box.dart
hasSize
"RenderBox was not laid out: RenderSemanticsAnnotations#f30b6 relayoutBoundary=up12 NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE"

The relevant error-causing widget was
AppBar
 lib/main.dart
════════════════════════════════════════════════════════════════════════════════

════════ Exception caught by rendering library ═════════════════════════════════
Unexpected null value.
The relevant error-causing widget was
TextFormField
 lib/main.dart
The following RenderObject was being processed when the exception was fired: RenderEditable#a1742 relayoutBoundary=up16 NEEDS-LAYOUT NEEDS-PAINT
RenderObject: RenderEditable#a1742 relayoutBoundary=up16 NEEDS-LAYOUT NEEDS-PAINT
    parentData: <none> (can use size)
    constraints: BoxConstraints(w=1200.0, 0.0<=h<=680.0)
    size: MISSING
    cursorColor: Color(0x002196f3)
    showCursor: ValueNotifier<bool>#b5932(true)
    maxLines: 1
    minLines: null
    selectionColor: Color(0x662196f3)
    textScaleFactor: 1.0
    locale: en_US
    selection: TextSelection(baseOffset: -1, extentOffset: -1, affinity: TextAffinity.downstream, isDirectional: false)
    offset: ScrollPositionWithSingleContext#18d5c(offset: 0.0, range: null..null, viewport: null, ScrollableState, BouncingScrollPhysics -> RangeMaintainingScrollPhysics, IdleScrollActivity#9ec36, ScrollDirection.idle)
    text: TextSpan
        debugLabel: (englishLike subhead 2014).merge(whiteRedwoodCity subtitle1)
        inherit: false
        color: Color(0xffffffff)
        family: .AppleSystemUIFont
        size: 16.0
        weight: 400
        baseline: alphabetic
        decoration: TextDecoration.none
        ""
════════════════════════════════════════════════════════════════════════════════

════════ Exception caught by rendering library ═════════════════════════════════
Assertion failed:
 ../…/rendering/box.dart
hasSize
"RenderBox was not laid out: RenderEditable#a1742 relayoutBoundary=up16 NEEDS-PAINT"

The relevant error-causing widget was
TextFormField
 lib/main.dart
════════════════════════════════════════════════════════════════════════════════

════════ Exception caught by rendering library ═════════════════════════════════
Assertion failed:
 ../…/rendering/box.dart
hasSize
"RenderBox was not laid out: RenderSemanticsAnnotations#a584b relayoutBoundary=up15 NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE"

The relevant error-causing widget was
TextFormField
 lib/main.dart
════════════════════════════════════════════════════════════════════════════════

════════ Exception caught by rendering library ═════════════════════════════════
Assertion failed:
 ../…/rendering/box.dart
hasSize
"RenderBox was not laid out: RenderLeaderLayer#8120a relayoutBoundary=up14 NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE"

The relevant error-causing widget was
TextFormField
 lib/main.dart
════════════════════════════════════════════════════════════════════════════════

════════ Exception caught by rendering library ═════════════════════════════════
Assertion failed:
 ../…/rendering/box.dart
hasSize
"RenderBox was not laid out: RenderIgnorePointer#24268 relayoutBoundary=up13 NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE"

The relevant error-causing widget was
TextFormField
 lib/main.dart
════════════════════════════════════════════════════════════════════════════════

════════ Exception caught by rendering library ═════════════════════════════════
Assertion failed:
 ../…/rendering/box.dart
hasSize
"RenderBox was not laid out: RenderSemanticsAnnotations#f3c62 relayoutBoundary=up12 NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE"

The relevant error-causing widget was
TextFormField
 lib/main.dart
════════════════════════════════════════════════════════════════════════════════

════════ Exception caught by rendering library ═════════════════════════════════
Assertion failed:
 ../…/rendering/box.dart
hasSize
"RenderBox was not laid out: RenderPointerListener#fbb28 relayoutBoundary=up11 NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE"

The relevant error-causing widget was
TextFormField
 lib/main.dart
════════════════════════════════════════════════════════════════════════════════

════════ Exception caught by rendering library ═════════════════════════════════
Assertion failed:
 ../…/rendering/box.dart
hasSize
"RenderBox was not laid out: RenderPointerListener#48b32 relayoutBoundary=up10 NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE"

The relevant error-causing widget was
TextFormField
 lib/main.dart
════════════════════════════════════════════════════════════════════════════════

════════ Exception caught by rendering library ═════════════════════════════════
Assertion failed:
 ../…/rendering/box.dart
hasSize
"RenderBox was not laid out: RenderMouseRegion#d66d7 relayoutBoundary=up9 NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE"

The relevant error-causing widget was
TextFormField
 lib/main.dart
════════════════════════════════════════════════════════════════════════════════

════════ Exception caught by rendering library ═════════════════════════════════
Unexpected null value.
The relevant error-causing widget was
TextFormField
 lib/main.dart
════════════════════════════════════════════════════════════════════════════════

════════ Exception caught by rendering library ═════════════════════════════════
Assertion failed:
 ../…/rendering/box.dart
hasSize
"RenderBox was not laid out: _RenderDecoration#decaa relayoutBoundary=up7 NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE"

The relevant error-causing widget was
TextFormField
 lib/main.dart
════════════════════════════════════════════════════════════════════════════════

════════ Exception caught by rendering library ═════════════════════════════════
Assertion failed:
 ../…/rendering/box.dart
hasSize
"RenderBox was not laid out: RenderPointerListener#d8aa7 relayoutBoundary=up6 NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE"

The relevant error-causing widget was
TextFormField
 lib/main.dart
════════════════════════════════════════════════════════════════════════════════

════════ Exception caught by rendering library ═════════════════════════════════
Assertion failed:
 ../…/rendering/box.dart
hasSize
"RenderBox was not laid out: RenderSemanticsAnnotations#7d455 relayoutBoundary=up5 NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE"

The relevant error-causing widget was
TextFormField
 lib/main.dart
════════════════════════════════════════════════════════════════════════════════

════════ Exception caught by rendering library ═════════════════════════════════
Assertion failed:
 ../…/rendering/box.dart
hasSize
"RenderBox was not laid out: RenderIgnorePointer#910f1 relayoutBoundary=up4 NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE"

The relevant error-causing widget was
TextFormField
 lib/main.dart
════════════════════════════════════════════════════════════════════════════════

════════ Exception caught by rendering library ═════════════════════════════════
Assertion failed:
 ../…/rendering/box.dart
hasSize
"RenderBox was not laid out: RenderMouseRegion#1ff1f relayoutBoundary=up3 NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE"

The relevant error-causing widget was
TextFormField
 lib/main.dart
════════════════════════════════════════════════════════════════════════════════

════════ Exception caught by rendering library ═════════════════════════════════
Assertion failed:
 ../…/rendering/shifted_box.dart
child!.hasSize
is not true

The relevant error-causing widget was
Center
 lib/main.dart
════════════════════════════════════════════════════════════════════════════════

════════ Exception caught by rendering library ═════════════════════════════════
Unexpected null value.
The relevant error-causing widget was
Icon
 lib/main.dart
The following RenderObject was being processed when the exception was fired: RenderParagraph#7672d relayoutBoundary=up1 NEEDS-LAYOUT NEEDS-PAINT
RenderObject: RenderParagraph#7672d relayoutBoundary=up1 NEEDS-LAYOUT NEEDS-PAINT
    parentData: offset=Offset(0.0, 0.0) (can use size)
    constraints: BoxConstraints(0.0<=w<=24.0, 0.0<=h<=24.0)
    size: MISSING
    textAlign: start
    textDirection: ltr
    softWrap: wrapping at box width
    overflow: visible
    locale: en_US
    maxLines: unlimited
    text: TextSpan
        inherit: false
        color: Color(0xff000000)
        family: MaterialIcons
        size: 24.0
        ""
════════════════════════════════════════════════════════════════════════════════

════════ Exception caught by rendering library ═════════════════════════════════
Assertion failed:
 ../…/rendering/shifted_box.dart
child!.hasSize
is not true

The relevant error-causing widget was
Icon
 lib/main.dart
════════════════════════════════════════════════════════════════════════════════

════════ Exception caught by rendering library ═════════════════════════════════
Assertion failed:
 ../…/rendering/box.dart
hasSize
"RenderBox was not laid out: RenderRepaintBoundary#6fc83 relayoutBoundary=up8 NEEDS-PAINT"

The relevant error-causing widget was
TextFormField
 lib/main.dart
════════════════════════════════════════════════════════════════════════════════

════════ Exception caught by rendering library ═════════════════════════════════
Unexpected null value.
The relevant error-causing widget was
Text
 lib/main.dart
The following RenderObject was being processed when the exception was fired: RenderParagraph#bb575 relayoutBoundary=up14
RenderObject: RenderParagraph#bb575 relayoutBoundary=up14
    parentData: offset=Offset(0.0, 0.0) (can use size)
    constraints: BoxConstraints(0.0<=w<=1168.0, 0.0<=h<=Infinity)
    size: MISSING
    textAlign: start
    textDirection: ltr
    softWrap: no wrapping except at line break characters
    overflow: ellipsis
    locale: en_US
    maxLines: unlimited
    text: TextSpan
        debugLabel: (englishLike title 2014).merge(whiteRedwoodCity headline6)
        inherit: false
        color: Color(0xffffffff)
        family: .AppleSystemUIFont
        size: 20.0
        weight: 500
        baseline: alphabetic
        decoration: TextDecoration.none
        "Material App Bar"
════════════════════════════════════════════════════════════════════════════════

════════ Exception caught by rendering library ═════════════════════════════════
Unexpected null value.
The relevant error-causing widget was
Icon
 lib/main.dart
The following RenderObject was being processed when the exception was fired: RenderParagraph#7672d relayoutBoundary=up1
RenderObject: RenderParagraph#7672d relayoutBoundary=up1
    parentData: offset=Offset(0.0, 0.0) (can use size)
    constraints: BoxConstraints(0.0<=w<=24.0, 0.0<=h<=24.0)
    size: MISSING
    textAlign: start
    textDirection: ltr
    softWrap: wrapping at box width
    overflow: visible
    locale: en_US
    maxLines: unlimited
    text: TextSpan
        inherit: false
        color: Color(0xff000000)
        family: MaterialIcons
        size: 24.0
        ""
════════════════════════════════════════════════════════════════════════════════

════════ Exception caught by rendering library ═════════════════════════════════
Unexpected null value.
The relevant error-causing widget was
MaterialApp
 lib/main.dart
════════════════════════════════════════════════════════════════════════════════
Restarted application in 1,871ms.
Restarted application in 380ms.

════════ Exception caught by rendering library ═════════════════════════════════
The following NativeJavaScriptObject object was thrown during paint():
  BindingError: Expected null or instance of Paragraph, got an instance of Paragraph

The relevant error-causing widget was
Text
 lib/main.dart
When the exception was thrown, this was the stack
<EMAIL_ADDRESS>153:76          <fn>
<EMAIL_ADDRESS>152:335         new BindingError
<EMAIL_ADDRESS>155:250         X
<EMAIL_ADDRESS>161:38          zc
<EMAIL_ADDRESS>164:310         Ec
...
The following RenderObject was being processed when the exception was fired: RenderParagraph#439e5 relayoutBoundary=up14
RenderObject: RenderParagraph#439e5 relayoutBoundary=up14
    parentData: offset=Offset(0.0, 0.0) (can use size)
    constraints: BoxConstraints(0.0<=w<=1168.0, 0.0<=h<=Infinity)
    size: Size(149.0, 23.0)
    textAlign: start
    textDirection: ltr
    softWrap: no wrapping except at line break characters
    overflow: ellipsis
    locale: en_US
    maxLines: unlimited
    text: TextSpan
        debugLabel: (englishLike title 2014).merge(whiteRedwoodCity headline6)
        inherit: false
        color: Color(0xffffffff)
        family: .AppleSystemUIFont
        size: 20.0
        weight: 500
        baseline: alphabetic
        decoration: TextDecoration.none
        "Material App Bar"
════════════════════════════════════════════════════════════════════════════════

════════ Exception caught by rendering library ═════════════════════════════════
  BindingError: Expected null or instance of Paragraph, got an instance of Paragraph
The relevant error-causing widget was
Icon
 lib/main.dart
The following RenderObject was being processed when the exception was fired: RenderParagraph#60abf relayoutBoundary=up1
RenderObject: RenderParagraph#60abf relayoutBoundary=up1
    parentData: offset=Offset(0.0, 0.0) (can use size)
    constraints: BoxConstraints(0.0<=w<=24.0, 0.0<=h<=24.0)
    size: Size(24.0, 24.0)
    textAlign: start
    textDirection: ltr
    softWrap: wrapping at box width
    overflow: visible
    locale: en_US
    maxLines: unlimited
    text: TextSpan
        inherit: false
        color: Color(0xff000000)
        family: MaterialIcons
        size: 24.0
        ""
════════════════════════════════════════════════════════════════════════════════

════════ Exception caught by scheduler library ═════════════════════════════════
  BindingError: Expected null or instance of Path, got an instance of Path
════════════════════════════════════════════════════════════════════════════════

flutter doctor -v
[✓] Flutter (Channel beta, 1.26.0-17.5.pre, on macOS 11.2.1 20D74 darwin-x64, locale en-GB)
    • Flutter version 1.26.0-17.5.pre at /Users/tahatesser/Code/flutter_beta
    • Framework revision 1fe38dcb5f (5 days ago), 2021-02-10 16:25:47 -0800
    • Engine revision d4453f6018
    • Dart version 2.12.0 (build 2.12.0-259.9.beta)
[✗] Android toolchain - develop for Android devices
    ✗ Unable to locate Android SDK.
      Install Android Studio from: https://developer.android.com/studio/index.html
      On first launch it will assist you in installing the Android SDK components.
      (or visit https://flutter.dev/docs/get-started/install/macos#android-setup for detailed instructions).
      If the Android SDK has been installed to a custom location, please use
      `flutter config --android-sdk` to update to that location.
[!] Xcode - develop for iOS and macOS
    • Xcode at /Volumes/Extreme/Xcode.app/Contents/Developer
    • Xcode 12.4, Build version 12D4e
    ✗ CocoaPods not installed.
        CocoaPods is used to retrieve the iOS and macOS platform side's plugin code that responds to your plugin usage on the Dart side.
        Without CocoaPods, plugins will not work on iOS or macOS.
        For more info, see https://flutter.dev/platform-plugins
      To install see https://guides.cocoapods.org/using/getting-started.html#installation for instructions.
[✓] Chrome - develop for the web
    • Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome
[✓] Android Studio (version 4.1)
    • Android Studio at /Applications/Android Studio.app/Contents
    • Flutter plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/9212-flutter
    • Dart plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/6351-dart
    • Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b3-6915495)
[✓] VS Code (version 1.53.2)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension version 3.19.0
[✓] Connected device (2 available)
    • Taha’s iPhone (mobile) • 00008020-001059882212002E • ios            • iOS 14.4
    • Chrome (web)           • chrome                    • web-javascript • Google Chrome 88.0.4324.150
! Doctor found issues in 2 categories.

[✓] Flutter (Channel dev, 1.27.0-1.0.pre, on macOS 11.2.1 20D74 darwin-x64, locale en-GB)
    • Flutter version 1.27.0-1.0.pre at /Users/tahatesser/Code/flutter_dev
    • Framework revision 68c96f100e (7 days ago), 2021-02-08 16:14:15 -0800
    • Engine revision b04955656c
    • Dart version 2.13.0 (build 2.13.0-0.0.dev)
[✗] Android toolchain - develop for Android devices
    ✗ Unable to locate Android SDK.
      Install Android Studio from: https://developer.android.com/studio/index.html
      On first launch it will assist you in installing the Android SDK components.
      (or visit https://flutter.dev/docs/get-started/install/macos#android-setup for detailed instructions).
      If the Android SDK has been installed to a custom location, please use
      `flutter config --android-sdk` to update to that location.
[!] Xcode - develop for iOS and macOS
    • Xcode at /Volumes/Extreme/Xcode.app/Contents/Developer
    • Xcode 12.4, Build version 12D4e
    ✗ CocoaPods not installed.
        CocoaPods is used to retrieve the iOS and macOS platform side's plugin code that responds to your plugin usage on the Dart side.
        Without CocoaPods, plugins will not work on iOS or macOS.
        For more info, see https://flutter.dev/platform-plugins
      To install see https://guides.cocoapods.org/using/getting-started.html#installation for instructions.
[✓] Chrome - develop for the web
    • Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome
[✓] Android Studio (version 4.1)
    • Android Studio at /Applications/Android Studio.app/Contents
    • Flutter plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/9212-flutter
    • Dart plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/6351-dart
    • Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b3-6915495)
[✓] VS Code (version 1.53.2)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension version 3.19.0
[✓] Connected device (3 available)
    • Taha’s iPhone (mobile) • 00008020-001059882212002E • ios            • iOS 14.4
    • macOS (desktop)        • macos                     • darwin-x64     • macOS 11.2.1 20D74 darwin-x64
    • Chrome (web)           • chrome                    • web-javascript • Google Chrome 88.0.4324.150
! Doctor found issues in 2 categories.

[✓] Flutter (Channel master, 1.27.0-2.0.pre.103, on macOS 11.2.1 20D74 darwin-x64, locale en-GB)
    • Flutter version 1.27.0-2.0.pre.103 at /Users/tahatesser/Code/flutter_master
    • Framework revision f49956598b (4 hours ago), 2021-02-16 00:56:06 -0500
    • Engine revision 1d537824d6
    • Dart version 2.13.0 (build 2.13.0-30.0.dev)
[✗] Android toolchain - develop for Android devices
    ✗ Unable to locate Android SDK.
      Install Android Studio from: https://developer.android.com/studio/index.html
      On first launch it will assist you in installing the Android SDK components.
      (or visit https://flutter.dev/docs/get-started/install/macos#android-setup for detailed instructions).
      If the Android SDK has been installed to a custom location, please use
      `flutter config --android-sdk` to update to that location.
[!] Xcode - develop for iOS and macOS
    • Xcode at /Volumes/Extreme/Xcode.app/Contents/Developer
    • Xcode 12.4, Build version 12D4e
    ✗ CocoaPods not installed.
        CocoaPods is used to retrieve the iOS and macOS platform side's plugin code that responds to your plugin usage on the Dart side.
        Without CocoaPods, plugins will not work on iOS or macOS.
        For more info, see https://flutter.dev/platform-plugins
      To install see https://guides.cocoapods.org/using/getting-started.html#installation for instructions.
[✓] Chrome - develop for the web
    • Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome
[✓] Android Studio (version 4.1)
    • Android Studio at /Applications/Android Studio.app/Contents
    • Flutter plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/9212-flutter
    • Dart plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/6351-dart
    • Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b3-6915495)
[✓] VS Code (version 1.53.2)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension version 3.19.0
[✓] Connected device (3 available)
    • Taha’s iPhone (mobile) • 00008020-001059882212002E • ios            • iOS 14.4
    • macOS (desktop)        • macos                     • darwin-x64     • macOS 11.2.1 20D74 darwin-x64
    • Chrome (web)           • chrome                    • web-javascript • Google Chrome 88.0.4324.150
! Doctor found issues in 2 categories.

I was able to reproduce this issue on current Beta channel.

logs
Performing hot restart...
[+1077 ms] Skipping target: gen_localizations
[        ] complete
[   +7 ms] Scanned through 519 files in 7ms
Waiting for connection from debug service on Chrome...
[        ] <- recompile org-dartlang-app:/web_entrypoint.dart 7d13ef3a-7a57-446f-9cae-244d4aeaaba6
[        ] <- 7d13ef3a-7a57-446f-9cae-244d4aeaaba6
[  +18 ms] Synced 0.0MB.
[        ] <- accept
[        ] DwdsVmClient: Attempting a hot restart
[        ] DwdsVmClient: Attempting to disabling breakpoints and resume the isolate
[   +5 ms] DwdsVmClient: Successfully disabled breakpoints and resumed the isolate
[        ] DwdsVmClient: Attempting to get execution context ID.
[        ] DwdsVmClient: Got execution context ID.
[        ] DwdsVmClient: Issuing $dartHotRestart request.
[  +14 ms] Error: Unexpected null value.
               at Object.throw_ [as throw] (http://localhost:59305/dart_sdk.js:5331:11)
               at Object.nullCheck (http://localhost:59305/dart_sdk.js:5664:30)
               at Object.get skiaFontCollection [as skiaFontCollection] (http://localhost:59305/dart_sdk.js:185112:19)
               at Object._getEffectiveFontFamilies (http://localhost:59305/dart_sdk.js:181684:35)
               at Function.toSkTextStyleProperties (http://localhost:59305/dart_sdk.js:144462:42)
               at Function.toSkParagraphStyle (http://localhost:59305/dart_sdk.js:144511:55)
               at new _engine.CkParagraphStyle.new (http://localhost:59305/dart_sdk.js:144532:55)
               at Function.new (http://localhost:59305/dart_sdk.js:133227:16)
               at DefaultShaderWarmUp.warmUpOnCanvas (http://localhost:59305/packages/flutter/src/painting/shader_warm_up.dart.lib.js:242:85)
               at warmUpOnCanvas.next (<anonymous>)
               at runBody (http://localhost:59305/dart_sdk.js:39049:34)
               at Object._async [as async] (http://localhost:59305/dart_sdk.js:39080:7)
               at DefaultShaderWarmUp.warmUpOnCanvas (http://localhost:59305/packages/flutter/src/painting/shader_warm_up.dart.lib.js:182:20)
               at DefaultShaderWarmUp.execute (http://localhost:59305/packages/flutter/src/painting/shader_warm_up.dart.lib.js:116:20)
               at execute.next (<anonymous>)
               at runBody (http://localhost:59305/dart_sdk.js:39049:34)
               at Object._async [as async] (http://localhost:59305/dart_sdk.js:39080:7)
               at DefaultShaderWarmUp.execute (http://localhost:59305/packages/flutter/src/painting/shader_warm_up.dart.lib.js:113:20)
               at binding$5.WidgetsFlutterBinding.new.initInstances (http://localhost:59305/packages/flutter/src/painting/binding.dart.lib.js:75:30)
               at binding$5.WidgetsFlutterBinding.new.initInstances (http://localhost:59305/packages/flutter/src/semantics/binding.dart.lib.js:42:13)
               at binding$5.WidgetsFlutterBinding.new.initInstances (http://localhost:59305/packages/flutter/src/rendering/layer.dart.lib.js:5934:13)
               at binding$5.WidgetsFlutterBinding.new.initInstances (http://localhost:59305/packages/flutter/src/widgets/widget_span.dart.lib.js:51407:13)
               at binding$5.WidgetsFlutterBinding.new.binding.BindingBase.new (http://localhost:59305/packages/flutter/src/foundation/binding.dart.lib.js:371:10)
               at binding$5.WidgetsFlutterBinding.new.BindingBase_GestureBinding$36.new (http://localhost:59305/packages/flutter/src/widgets/widget_span.dart.lib.js:51984:49)
               at binding$5.WidgetsFlutterBinding.new.BindingBase_SchedulerBinding$36.new (http://localhost:59305/packages/flutter/src/widgets/widget_span.dart.lib.js:51990:51)
               at binding$5.WidgetsFlutterBinding.new.BindingBase_ServicesBinding$36.new (http://localhost:59305/packages/flutter/src/widgets/widget_span.dart.lib.js:51996:50)
               at binding$5.WidgetsFlutterBinding.new.BindingBase_PaintingBinding$36.new (http://localhost:59305/packages/flutter/src/widgets/widget_span.dart.lib.js:52002:50)
               at binding$5.WidgetsFlutterBinding.new.BindingBase_SemanticsBinding$36.new (http://localhost:59305/packages/flutter/src/widgets/widget_span.dart.lib.js:52008:51)
               at binding$5.WidgetsFlutterBinding.new.BindingBase_RendererBinding$36.new (http://localhost:59305/packages/flutter/src/widgets/widget_span.dart.lib.js:52014:50)
               at binding$5.WidgetsFlutterBinding.new.BindingBase_WidgetsBinding$36.new (http://localhost:59305/packages/flutter/src/widgets/widget_span.dart.lib.js:52020:49)
               at new binding$5.WidgetsFlutterBinding.new (http://localhost:59305/packages/flutter/src/widgets/widget_span.dart.lib.js:52030:51)
               at Function.ensureInitialized (http://localhost:59305/packages/flutter/src/widgets/widget_span.dart.lib.js:52025:54)
               at Object.runApp (http://localhost:59305/packages/flutter/src/widgets/widget_span.dart.lib.js:52039:43)
               at main$ (http://localhost:59305/packages/triage/main.dart.lib.js:162:20)
               at main (http://localhost:59305/web_entrypoint.dart.lib.js:49:29)
               at main.next (<anonymous>)
               at http://localhost:59305/dart_sdk.js:39029:33
               at _RootZone.runUnary (http://localhost:59305/dart_sdk.js:38886:58)
               at _FutureListener.thenAwait.handleValue (http://localhost:59305/dart_sdk.js:33872:29)
               at handleValueCallback (http://localhost:59305/dart_sdk.js:34432:49)
               at Function._propagateToListeners (http://localhost:59305/dart_sdk.js:34470:17)
               at _Future.new.[_completeWithValue] (http://localhost:59305/dart_sdk.js:34312:23)
               at http://localhost:59305/dart_sdk.js:33523:46