[Mobile] Checklist Error - type 'Null' is not a subtype of type 'Block' in type cast

[kulture-rob-snider]

My issue is about [Mobile]

I have tried running example directory successfully before creating an issue here.

Repro Steps

1. Use the sample_date.json below
2. Continually check/uncheck D
3. The cursor jumps around and after a few clicks the following error is triggered. It seems to be when the cursor jumps down

error

======== Exception caught by gesture ===============================================================
The following _CastError was thrown while handling a gesture:
type 'Null' is not a subtype of type 'Block' in type cast

When the exception was thrown, this was the stack: 
#0      Document.queryChild (package:flutter_quill/src/models/documents/document.dart:185:28)
#1      Document.querySegmentLeafNode (package:flutter_quill/src/models/documents/document.dart:191:20)
#2      _QuillEditorSelectionGestureDetectorBuilder._isPositionSelected (package:flutter_quill/src/widgets/editor.dart:557:44)
#3      _QuillEditorSelectionGestureDetectorBuilder.onSingleTapUp (package:flutter_quill/src/widgets/editor.dart:601:41)
#4      _EditorTextSelectionGestureDetectorState._handleTapUp (package:flutter_quill/src/widgets/text_selection.dart:803:30)
#5      TapGestureRecognizer.handleTapUp.<anonymous closure> (package:flutter/src/gestures/tap.dart:606:57)
#6      GestureRecognizer.invokeCallback (package:flutter/src/gestures/recognizer.dart:198:24)
#7      TapGestureRecognizer.handleTapUp (package:flutter/src/gestures/tap.dart:606:11)
#8      BaseTapGestureRecognizer._checkUp (package:flutter/src/gestures/tap.dart:296:5)
#9      BaseTapGestureRecognizer.acceptGesture (package:flutter/src/gestures/tap.dart:267:7)
#10     _TransparentTapGestureRecognizer.rejectGesture (package:flutter_quill/src/widgets/text_selection.dart:1013:7)
#11     GestureArenaManager.sweep (package:flutter/src/gestures/arena.dart:160:26)
#12     GestureBinding.handleEvent (package:flutter/src/gestures/binding.dart:443:20)
#13     GestureBinding.dispatchEvent (package:flutter/src/gestures/binding.dart:419:22)
#14     RendererBinding.dispatchEvent (package:flutter/src/rendering/binding.dart:322:11)
#15     GestureBinding._handlePointerEventImmediately (package:flutter/src/gestures/binding.dart:374:7)
#16     GestureBinding.handlePointerEvent (package:flutter/src/gestures/binding.dart:338:5)
#17     GestureBinding._flushPointerEventQueue (package:flutter/src/gestures/binding.dart:296:7)
#18     GestureBinding._handlePointerDataPacket (package:flutter/src/gestures/binding.dart:279:7)
#22     _invoke1 (dart:ui/hooks.dart:170:10)
#23     PlatformDispatcher._dispatchPointerDataPacket (dart:ui/platform_dispatcher.dart:331:7)
#24     _dispatchPointerDataPacket (dart:ui/hooks.dart:94:31)
(elided 3 frames from dart:async)
Handler: "onTapUp"
Recognizer: _TransparentTapGestureRecognizer#f365e
  debugOwner: _EditorTextSelectionGestureDetectorState#fa6b6
  state: ready
  won arena
  finalPosition: Offset(30.7, 197.3)
  finalLocalPosition: Offset(14.7, 97.3)
  button: 1
  sent tap down
====================================================================================================

sample_data.json

[
  {
    "insert": "A"
  },
  {
    "insert": "\n",
    "attributes": {
      "list": "checked"
    }
  },
  {
    "insert": "B"
  },
  {
    "insert": "\n",
    "attributes": {
      "list": "checked"
    }
  },
  {
    "insert": "C"
  },
  {
    "insert": "\n",
    "attributes": {
      "list": "checked"
    }
  },
  {
    "insert": "D"
  },
  {
    "insert": "\n",
    "attributes": {
      "list": "checked"
    }
  },
  {
    "insert": "E"
  },
  {
    "insert": "\n",
    "attributes": {
      "list": "unchecked"
    }
  }
]

[jatin-web]

have you got the solution ??

[singerdmx]

This is already fixed, right?