[Mobile] error when toggling checkbox

[Dan-Crane]

My issue is about [Mobile]
When im toggling checkbox, i get this error:

[sentry] [debug] Capture from onError type 'Null' is not a subtype of type 'Block' in type cast
D/Sentry  (29749): onEvent fired for EnvelopeFileObserver with event type 8 on path: /data/user/0/app.listta.goals/cache/sentry/outbox for file 64345d38-9bcb-45f8-8c6f-67d6b045c443.
E/flutter (29749): [ERROR:flutter/lib/ui/ui_dart_state.cc(209)] Unhandled Exception: type 'Null' is not a subtype of type 'Block' in type cast
E/flutter (29749): #0      Document.queryChild
E/flutter (29749): #1      Document.querySegmentLeafNode
E/flutter (29749): #2      _QuillEditorSelectionGestureDetectorBuilder._isPositionSelected
E/flutter (29749): #3      _QuillEditorSelectionGestureDetectorBuilder.onSingleTapUp
E/flutter (29749): #4      _EditorTextSelectionGestureDetectorState._handleTapUp
E/flutter (29749): #5      TapGestureRecognizer.handleTapUp.<anonymous closure>
E/flutter (29749): #6      GestureRecognizer.invokeCallback
E/flutter (29749): #7      TapGestureRecognizer.handleTapUp
E/flutter (29749): #8      BaseTapGestureRecognizer._checkUp
E/flutter (29749): #9      BaseTapGestureRecognizer.acceptGesture
E/flutter (29749): #10     _TransparentTapGestureRecognizer.rejectGesture
E/flutter (29749): #11     GestureArenaManager.sweep
E/flutter (29749): #12     GestureBinding.handleEvent
E/flutter (29749): #13     GestureBinding.dispatchEvent
E/flutter (29749): #14     RendererBinding.dispatchEvent
E/flutter (29749): #15     GestureBinding._handlePointerEventImmediately
E/flutter (29749): #16     GestureBinding.handlePointerEvent
E/flutter (29749): #17     GestureBinding._flushPointerEventQueue
E/flutter (29749): #18     GestureBinding._handlePointerDataPacket
E/flutter (29749): #19     _rootRunUnary (dart:async/zone.dart:1442:13)
E/flutter (29749): #20     _CustomZone.runUnary (dart:async/zone.dart:1335:19)
E/flutter (29749): #21     _CustomZone.runUnaryGuarded (dart:async/zone.dart:1244:7)
E/flutter (29749): #22     _invoke1 (dart:ui/hooks.dart:170:10)
E/flutter (29749): #23     PlatformDispatcher._dispatchPointerDataPacket (dart:ui/platform_dispatcher.dart:331:7)
E/flutter (29749): #24     _dispatchPointerDataPacket (dart:ui/hooks.dart:94:31)
E/flutter (29749):
D/Sentry  (29749): Processing Envelope with 1 item(s)
I/flutter (29749): App: �[38;5;196m┌───────────────────────────────────────────────────────────────────────────────
I/flutter (29749): App: �[38;5;196m│ �[48;5;196mtype 'Null' is not a subtype of type 'Block' in type cast
I/flutter (29749): App: �[38;5;196m├┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄
I/flutter (29749): App: �[38;5;196m│ #0   Document.queryChild (package:flutter_quill/src/models/documents/document.dart:185:28)
I/flutter (29749): App: �[38;5;196m│ #1   Document.querySegmentLeafNode (package:flutter_quill/src/models/documents/document.dart:191:20)
I/flutter (29749): App: �[38;5;196m│ #2   _QuillEditorSelectionGestureDetectorBuilder._isPositionSelected (package:flutter_quill/src/widgets/editor.dart:551:44)
I/flutter (29749): App: �[38;5;196m│ #3   _QuillEditorSelectionGestureDetectorBuilder.onSingleTapUp (package:flutter_quill/src/widgets/editor.dart:595:41)
I/flutter (29749): App: �[38;5;196m│ #4   _EditorTextSelectionGestureDetectorState._handleTapUp (package:flutter_quill/src/widgets/text_selection.dart:803:30)
I/flutter (29749): App: �[38;5;196m│ #5   TapGestureRecognizer.handleTapUp.<anonymous closure> (package:flutter/src/gestures/tap.dart:606:57)
I/flutter (29749): App: �[38;5;196m│ #6   GestureRecognizer.invokeCallback (package:flutter/src/gestures/recognizer.dart:198:24)
I/flutter (29749): App: �[38;5;196m│ #7   TapGestureRecognizer.handleTapUp (package:flutter/src/gestures/tap.dart:606:11)
I/flutter (29749): App: �[38;5;196m│ #8   BaseTapGestureRecognizer._checkUp (package:flutter/src/gestures/tap.dart:296:5)
I/flutter (29749): App: �[38;5;196m│ #9   BaseTapGestureRecognizer.acceptGesture (package:flutter/src/gestures/tap.dart:267:7)
I/flutter (29749): App: �[38;5;196m├┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄
I/flutter (29749): App: �[38;5;196m│ ⛔ CRASH: 
I/flutter (29749): App: �[38;5;196m└───────────────────────────────────────────────────────────────────────────────

Also, when I add a custom checkbox, toggling one checkbox may also toggle the other:

Video:

Screen.Recording.2022-03-18.at.22.01.50.mov

Code:

class DescriptionRow extends StatelessWidget {
  final QuillController descriptionController;
  final FocusNode focusNode;
  final ScrollController scrollController;
  final String hintText;
  final bool showIcon;
  final EdgeInsetsGeometry? contentPadding;
  final bool readOnly;

  const DescriptionRow({
    Key? key,
    required this.descriptionController,
    required this.focusNode,
    required this.scrollController,
    required this.hintText,
    this.showIcon = true,
    this.contentPadding,
    this.readOnly = false,
  }) : super(key: key);

  @override
  Widget build(BuildContext context) {
    final appThemeData = AppTheme.of(context).appThemeData;

    return Padding(
      padding: contentPadding ??
          const EdgeInsets.symmetric(
            horizontal: AppThemeData.mainPadding,
            vertical: AppThemeData.halfPadding * 1.25,
          ),
      child: Row(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          if (showIcon) ...[
            SvgPicture.asset(
              Svgs.icAddTaskDescription,
              color: appThemeData.primaryColor,
              matchTextDirection: true,
            ),
            const SizedBox(width: 12),
          ],
          Expanded(
            child: QuillEditor(
              customStyles: DefaultStyles(
                lists: DefaultListBlockStyle(
                  const TextStyle(),
                  const Tuple2<double, double>(6.0, 0.0),
                  const Tuple2<double, double>(0.0, 6.0),
                  null,
                  const CheckboxX(),
                ),
              ),
              key: Keys.editDescription,
              controller: descriptionController,
              focusNode: focusNode,
              scrollController: scrollController,
              padding: EdgeInsets.zero,
              scrollable: false,
              autoFocus: false,
              readOnly: readOnly,
              expands: false,
              placeholder: hintText,
            ),
          )
        ],
      ),
    );
  }
}

class CheckboxX implements QuillCheckboxBuilder {
  const CheckboxX();

  @override
  Widget build({
    required BuildContext context,
    required bool isChecked,
    required ValueChanged<bool> onChanged,
  }) {
    final appThemeData = AppTheme.of(context).appThemeData;

    return Checkbox(
      key: Keys.taskListItemCheckbox,
      activeColor: appThemeData.accentLightColor,
      value: isChecked,
      shape: const RoundedRectangleBorder(
        borderRadius: BorderRadius.all(Radius.circular(4)),
      ),
      onChanged: (value) {
        print('==== onChange $value');
        onChanged.call(value ?? false);
        // if (value == null) return;
        // onChanged.call(value);
      },
    );
  }
}

version of flutter_quill -- 4.0.10

flutter doctor -v

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    #1      Utf8Decoder.convert (dart:convert/utf.dart:351:42)
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    #10     asyncGuard.<anonymous closure> (package:flutter_tools/src/base/async_guard.dart:111:32)
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    #13     _CustomZone.run (dart:async/zone.dart:1328:19)
    #14     _runZoned (dart:async/zone.dart:1861:10)
    #15     runZonedGuarded (dart:async/zone.dart:1849:12)
    #16     runZoned (dart:async/zone.dart:1780:12)
    #17     asyncGuard (package:flutter_tools/src/base/async_guard.dart:109:3)
    #18     Doctor.startValidatorTasks (package:flutter_tools/src/doctor.dart:205:9)
    #19     Doctor.diagnose (package:flutter_tools/src/doctor.dart:309:47)
    #20     DoctorCommand.runCommand (package:flutter_tools/src/commands/doctor.dart:50:48)
    #21     FlutterCommand.verifyThenRunCommand (package:flutter_tools/src/runner/flutter_command.dart:1320:12)
    <asynchronous suspension>
    #22     FlutterCommand.run.<anonymous closure> (package:flutter_tools/src/runner/flutter_command.dart:1161:27)
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    #23     AppContext.run.<anonymous closure> (package:flutter_tools/src/base/context.dart:150:19)
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    #26     AppContext.run.<anonymous closure> (package:flutter_tools/src/base/context.dart:150:19)
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! Doctor found issues in 1 category.                                                                                            9s