[Web Error]: Expected a value of type 'SkDeletable', but got one of type 'Null'

[romain-bajoit-iot-d]

Cannot paint some neumorphic widgets.
Neumorphic of depth=0, disabled NeumorphicButton, pressed NeumorphicButton ...

Error

======== Exception caught by rendering library =====================================================
The following TypeErrorImpl was thrown during paint():
Expected a value of type 'SkDeletable', but got one of type 'Null'

The relevant error-causing widget was: 
AnimatedContainer file:///Users/romainbajoit/Documents/dev/flutter/.pub-cache/hosted/pub.dartlang.org/flutter_neumorphic-3.1.0/lib/src/widget/container.dart:122:14
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/errors.dart 84:3           castError
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/types.dart 266:34          as
lib/_engine/engine/canvaskit/skia_object_cache.dart 146:55                           new
lib/_engine/engine/canvaskit/mask_filter.dart 10:3                                   blur
...
The following RenderObject was being processed when the exception was fired: RenderDecoratedBox#532e5 relayoutBoundary=up5
...  parentData: <none> (can use size)
...  constraints: BoxConstraints(0.0<=w<=Infinity, 0.0<=h<=884.0)
...  size: Size(23.0, 16.0)
...  decoration: NeumorphicDecoration
...  configuration: ImageConfiguration(bundle: PlatformAssetBundle#bb91a(), devicePixelRatio: 2.0, locale: en_US, textDirection: TextDirection.ltr, platform: macOS)
RenderObject: RenderDecoratedBox#532e5 relayoutBoundary=up5
parentData: <none> (can use size)
constraints: BoxConstraints(0.0<=w<=Infinity, 0.0<=h<=884.0)
size: Size(23.0, 16.0)
decoration: NeumorphicDecoration
configuration: ImageConfiguration(bundle: PlatformAssetBundle#bb91a(), devicePixelRatio: 2.0, locale: en_US, textDirection: TextDirection.ltr, platform: macOS)
...  child: RenderPadding#4e4b6 relayoutBoundary=up6 NEEDS-PAINT
...    parentData: <none> (can use size)
...    constraints: BoxConstraints(0.0<=w<=Infinity, 0.0<=h<=884.0)
...    size: Size(23.0, 16.0)
...    padding: EdgeInsets.zero
...    textDirection: ltr
...    child: RenderClipPath#31c31 relayoutBoundary=up7 NEEDS-PAINT
...      parentData: offset=Offset(0.0, 0.0) (can use size)
...      constraints: BoxConstraints(0.0<=w<=Infinity, 0.0<=h<=884.0)
...      size: Size(23.0, 16.0)
...      child: RenderPadding#df819 relayoutBoundary=up8 NEEDS-PAINT
...        parentData: <none> (can use size)
...        constraints: BoxConstraints(0.0<=w<=Infinity, 0.0<=h<=884.0)
...        size: Size(23.0, 16.0)
...        padding: EdgeInsets.zero
...        textDirection: ltr
...        child: RenderParagraph#2ddeb relayoutBoundary=up9 NEEDS-PAINT
...          parentData: offset=Offset(0.0, 0.0) (can use size)
...          constraints: BoxConstraints(0.0<=w<=Infinity, 0.0<=h<=884.0)
...          size: Size(23.0, 16.0)
...          textAlign: start
...          textDirection: ltr
...          softWrap: wrapping at box width
...          overflow: clip
...          locale: en_US
...          maxLines: unlimited
====================================================================================================

======== Exception caught by rendering library =====================================================
Expected a value of type 'SkDeletable', but got one of type 'Null'
The relevant error-causing widget was: 
AnimatedContainer file:///Users/romainbajoit/Documents/dev/flutter/.pub-cache/hosted/pub.dartlang.org/flutter_neumorphic-3.1.0/lib/src/widget/container.dart:122:14
====================================================================================================

Code to reproduce the error

The error is triggered on build for the Neumorpic. It is not displayed on screen.
The error is triggered when the button is pressed on.

import 'package:flutter_neumorphic/flutter_neumorphic.dart';

void main() => runApp(MainApp());

class MainApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return NeumorphicApp(
      title: 'abc',
      home: ABC(),
    );
  }
}

class ABC extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Center(
        child: Row(
          children: [
            NeumorphicButton(
              child: Text('abc'),
              onPressed: () => print('a'),
            ),
            Neumorphic(
              child: Text('abc'),
              style: NeumorphicStyle(depth: 0.0),
            ),
          ],
        ),
      ),
    );
  }
}

Excecution environment

Executed with and without --no-sound-null-safety, it does not change the behavior

[✓] Flutter (Channel beta, 2.0.2, on macOS 11.0.1 20B29 darwin-x64, locale en-BE)
  • Flutter version 2.0.2 at /Users/romainbajoit/Documents/dev/flutter
  • Framework revision 8962f6dc68 (3 weeks ago), 2021-03-11 13:22:20 -0800
  • Engine revision 5d8bf811b3
  • Dart version 2.12.1

[✓] Android toolchain - develop for Android devices (Android SDK version 30.0.1)
  • Android SDK at /Users/romainbajoit/Library/Android/sdk
  • Platform android-30, build-tools 30.0.1
  • Java binary at: /Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/bin/java
  • Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b3-6915495)
  • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS
  • Xcode at /Applications/Xcode.app/Contents/Developer
  • Xcode 12.4, Build version 12D4e
  • CocoaPods version 1.10.1

[✓] 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)

[✓] IntelliJ IDEA Ultimate Edition (version 2020.2)
  • IntelliJ at /Applications/IntelliJ IDEA.app
  • Flutter plugin can be installed from:
    🔨 https://plugins.jetbrains.com/plugin/9212-flutter
  • Dart plugin version 202.6397.47

[✓] Connected device (1 available)
  • Chrome (web) • chrome • web-javascript • Google Chrome 89.0.4389.114

• No issues found!

[ppshah2023]

What is this problem with people closing their issues. I say this because the problem still remains. Specifically, the issue is still (to keep it brief) an issue.

[AryashDubey]

I also got this issue with the tab bar widget. Hope this issue resolves soon!