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Null check operator used on a null value #171

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tauqeerkhattak opened this issue Oct 21, 2024 · 1 comment
Open

Null check operator used on a null value #171

tauqeerkhattak opened this issue Oct 21, 2024 · 1 comment
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T: Fix Type: :bug: Bug Fixes

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@tauqeerkhattak
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When using DatePageView, the following error is thrown:
StackTrace

The following _TypeError was thrown building ValueListenableBuilder<bool>(state:
I/flutter ( 1190): _ValueListenableBuilderState<bool>#35fd9):
I/flutter ( 1190): Null check operator used on a null value
I/flutter ( 1190): 
I/flutter ( 1190): The relevant error-causing widget was:
I/flutter ( 1190):   DatePageView
I/flutter ( 1190):   DatePageView:file:///D:/StudioProjects/organaise/organai_flutter/lib/ui/common/widgets/app_events_table.dart:725:21
I/flutter ( 1190): 
I/flutter ( 1190): When the exception was thrown, this was the stack:
I/flutter ( 1190): #0      ScrollPosition.pixels (package:flutter/src/widgets/scroll_position.dart:253:31)
I/flutter ( 1190): #1      ScrollController.offset (package:flutter/src/widgets/scroll_controller.dart:165:33)
I/flutter ( 1190): #2      ScrollController.debugFillDescription (package:flutter/src/widgets/scroll_controller.dart:329:45)
I/flutter ( 1190): #3      ScrollController.toString (package:flutter/src/widgets/scroll_controller.dart:304:5)
I/flutter ( 1190): #4      _StringBase._interpolate (dart:core-patch/string_patch.dart:871:19)
I/flutter ( 1190): #5      MultiDateScrollPosition.debugFillDescription (package:timetable/src/date/date_page_view.dart:327:36)
I/flutter ( 1190): #6      ViewportOffset.toString (package:flutter/src/rendering/viewport_offset.dart:266:5)
I/flutter ( 1190): #7      DiagnosticsProperty.valueToString (package:flutter/src/foundation/diagnostics.dart:2622:60)
I/flutter ( 1190): #8      DiagnosticsProperty.toDescription (package:flutter/src/foundation/diagnostics.dart:2639:21)
I/flutter ( 1190): #9      TextTreeRenderer._debugRender (package:flutter/src/foundation/diagnostics.dart:1201:31)
I/flutter ( 1190): #10     TextTreeRenderer.render (package:flutter/src/foundation/diagnostics.dart:1131:14)
I/flutter ( 1190): #11     TextTreeRenderer._debugRender (package:flutter/src/foundation/diagnostics.dart:1317:39)
I/flutter ( 1190): #12     TextTreeRenderer.render (package:flutter/src/foundation/diagnostics.dart:1131:14)
I/flutter ( 1190): #13     DiagnosticsNode.toStringDeep.<anonymous closure> (package:flutter/src/foundation/diagnostics.dart:1777:9)
I/flutter ( 1190): #14     DiagnosticsNode.toStringDeep (package:flutter/src/foundation/diagnostics.dart:1784:6)
I/flutter ( 1190): #15     DiagnosticsNode.toString.<anonymous closure> (package:flutter/src/foundation/diagnostics.dart:1706:18)
I/flutter ( 1190): #16     DiagnosticsNode.toString (package:flutter/src/foundation/diagnostics.dart:1718:6)
I/flutter ( 1190): #17     Diagnosticable.toString.<anonymous closure> (package:flutter/src/foundation/diagnostics.dart:3014:78)
I/flutter ( 1190): #18     Diagnosticable.toString (package:flutter/src/foundation/diagnostics.dart:3016:6)
I/flutter ( 1190): #19     DiagnosticsProperty.valueToString (package:flutter/src/foundation/diagnostics.dart:2622:60)
I/flutter ( 1190): #20     DiagnosticsProperty.toDescription (package:flutter/src/foundation/diagnostics.dart:2639:21)
I/flutter ( 1190): #21     TextTreeRenderer._debugRender (package:flutter/src/foundation/diagnostics.dart:1201:31)
I/flutter ( 1190): #22     TextTreeRenderer.render (package:flutter/src/foundation/diagnostics.dart:1131:14)
I/flutter ( 1190): #23     TextTreeRenderer._debugRender (package:flutter/src/foundation/diagnostics.dart:1317:39)
I/flutter ( 1190): #24     TextTreeRenderer.render (package:flutter/src/foundation/diagnostics.dart:1131:14)
I/flutter ( 1190): #25     DiagnosticsNode.toStringDeep.<anonymous closure> (package:flutter/src/foundation/diagnostics.dart:1777:9)
I/flutter ( 1190): #26     DiagnosticsNode.toStringDeep (package:flutter/src/foundation/diagnostics.dart:1784:6)
I/flutter ( 1190): #27     DiagnosticsNode.toString.<anonymous closure> (package:flutter/src/foundation/diagnostics.dart:1706:18)
I/flutter ( 1190): #28     DiagnosticsNode.toString (package:flutter/src/foundation/diagnostics.dart:1718:6)
I/flutter ( 1190): #29     Diagnosticable.toString.<anonymous closure> (package:flutter/src/foundation/diagnostics.dart:3014:78)
I/flutter ( 1190): #30     Diagnosticable.toString (package:flutter/src/foundation/diagnostics.dart:3016:6)
I/flutter ( 1190): #31     _StringBase._interpolate (dart:core-patch/string_patch.dart:871:19)
I/flutter ( 1190): #32     Element.rebuild.<anonymous closure> (package:flutter/src/widgets/framework.dart:5316:38)
I/flutter ( 1190): #33     Element.rebuild (package:flutter/src/widgets/framework.dart:5323:6)
I/flutter ( 1190): #34     ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:5599:5)
I/flutter ( 1190): #35     StatefulElement._firstBuild (package:flutter/src/widgets/framework.dart:5771:11)
I/flutter ( 1190): #36     ComponentElement.mount (package:flutter/src/widgets/framework.dart:5593:5)
I/flutter ( 1190): ...     Normal element mounting (28 frames)
I/flutter ( 1190): #64     Element.inflateWidget (package:flutter/src/widgets/framework.dart:4468:16)
I/flutter ( 1190): #65     MultiChildRenderObjectElement.inflateWidget (package:flutter/src/widgets/framework.dart:7035:36)
I/flutter ( 1190): #66     MultiChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:7047:32)
I/flutter ( 1190): ...     Normal element mounting (7 frames)
I/flutter ( 1190): #73     Element.inflateWidget (package:flutter/src/widgets/framework.dart:4468:16)
I/flutter ( 1190): #74     MultiChildRenderObjectElement.inflateWidget (package:flutter/src/widgets/framework.dart:7035:36)
I/flutter ( 1190): #75     MultiChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:7047:32)
I/flutter ( 1190): ...     Normal element mounting (33 frames)
I/flutter ( 1190): #108    Element.inflateWidget (package:flutter/src/widgets/framework.dart:4468:16)
I/flutter ( 1190): #109    MultiChildRenderObjectElement.inflateWidget (package:flutter/src/widgets/framework.dart:7035:36)
I/flutter ( 1190): #110    MultiChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:7047:32)
I/flutter ( 1190): #111    Element.inflateWidget (package:flutter/src/widgets/framework.dart:4468:16)
I/flutter ( 1190): #112    Element.updateChild (package:flutter/src/widgets/framework.dart:3963:18)
I/flutter ( 1190): #113    _LayoutBuilderElement._rebuildWithConstraints.updateChildCallback (package:flutter/src/widgets/layout_builder.dart:207:18)
I/flutter ( 1190): #114    BuildOwner.buildScope (package:flutter/src/widgets/framework.dart:3038:19)
I/flutter ( 1190): #115    _LayoutBuilderElement._rebuildWithConstraints (package:flutter/src/widgets/layout_builder.dart:231:12)
I/flutter ( 1190): #116    RenderObject.invokeLayoutCallback.<anonymous closure> (package:flutter/src/rendering/object.dart:2719:59)
I/flutter ( 1190): #117    PipelineOwner._enableMutationsToDirtySubtrees (package:flutter/src/rendering/object.dart:1098:15)
I/flutter ( 1190): #118    RenderObject.invokeLayoutCallback (package:flutter/src/rendering/object.dart:2719:14)
I/flutter ( 1190): #119    RenderConstrainedLayoutBuilder.rebuildIfNecessary (package:flutter/src/widgets/layout_builder.dart:278:5)
I/flutter ( 1190): #120    _RenderLayoutBuilder.performLayout (package:flutter/src/widgets/layout_builder.dart:369:5)
I/flutter ( 1190): #121    RenderObject.layout (package:flutter/src/rendering/object.dart:2608:7)
I/flutter ( 1190): #122    RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:111:21)
I/flutter ( 1190): #123    RenderObject.layout (package:flutter/src/rendering/object.dart:2608:7)
I/flutter ( 1190): #124    ChildLayoutHelper.layoutChild (package:flutter/src/rendering/layout_helper.dart:61:11)
I/flutter ( 1190): #125    RenderFlex._computeSizes (package:flutter/src/rendering/flex.dart:1009:71)
I/flutter ( 1190): #126    RenderFlex.performLayout (package:flutter/src/rendering/flex.dart:1051:32)
I/flutter ( 1190): #127    RenderObject.layout (package:flutter/src/rendering/object.dart:2608:7)
I/flutter ( 1190): #128    ChildLayoutHelper.layoutChild (package:flutter/src/rendering/layout_helper.dart:61:11)
I/flutter ( 1190): #129    RenderStack._computeSize (package:flutter/src/rendering/stack.dart:595:43)
I/flutter ( 1190): #130    RenderStack.performLayout (package:flutter/src/rendering/stack.dart:622:12)
I/flutter ( 1190): #131    RenderObject.layout (package:flutter/src/rendering/object.dart:2608:7)
I/flutter ( 1190): #132    RenderPadding.performLayout (package:flutter/src/rendering/shifted_box.dart:234:12)
I/flutter ( 1190): #133    RenderObject.layout (package:flutter/src/rendering/object.dart:2608:7)
I/flutter ( 1190): #134    MultiChildLayoutDelegate.layoutChild (package:flutter/src/rendering/custom_layout.dart:173:12)
I/flutter ( 1190): #135    _ScaffoldLayout.performLayout (package:flutter/src/material/scaffold.dart:1092:7)
I/flutter ( 1190): #136    MultiChildLayoutDelegate._callPerformLayout (package:flutter/src/rendering/custom_layout.dart:237:7)
I/flutter ( 1190): #137    RenderCustomMultiChildLayoutBox.performLayout (package:flutter/src/rendering/custom_layout.dart:404:14)
I/flutter ( 1190): #138    RenderObject.layout (package:flutter/src/rendering/object.dart:2608:7)
I/flutter ( 1190): #139    RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:111:21)
I/flutter ( 1190): #140    RenderObject.layout (package:flutter/src/rendering/object.dart:2608:7)
I/flutter ( 1190): #141    RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:111:21)
I/flutter ( 1190): #142    _RenderCustomClip.performLayout (package:flutter/src/rendering/proxy_box.dart:1448:11)
I/flutter ( 1190): #143    RenderObject.layout (package:flutter/src/rendering/object.dart:2608:7)
I/flutter ( 1190): #144    _RenderLayoutBuilder.performLayout (package:flutter/src/widgets/layout_builder.dart:371:14)
I/flutter ( 1190): #145    RenderObject.layout (package:flutter/src/rendering/object.dart:2608:7)
I/flutter ( 1190): #146    MultiChildLayoutDelegate.layoutChild (package:flutter/src/rendering/custom_layout.dart:173:12)
I/flutter ( 1190): #147    _ScaffoldLayout.performLayout (package:flutter/src/material/scaffold.dart:1092:7)
I/flutter ( 1190): #148    MultiChildLayoutDelegate._callPerformLayout (package:flutter/src/rendering/custom_layout.dart:237:7)
I/flutter ( 1190): #149    RenderCustomMultiChildLayoutBox.performLayout (package:flutter/src/rendering/custom_layout.dart:404:14)
I/flutter ( 1190): #150    RenderObject._layoutWithoutResize (package:flutter/src/rendering/object.dart:2446:7)
I/flutter ( 1190): #151    PipelineOwner.flushLayout (package:flutter/src/rendering/object.dart:1052:18)
I/flutter ( 1190): #152    PipelineOwner.flushLayout (package:flutter/src/rendering/object.dart:1065:15)
I/flutter ( 1190): #153    RendererBinding.drawFrame (package:flutter/src/rendering/binding.dart:602:23)
I/flutter ( 1190): #154    WidgetsBinding.drawFrame (package:flutter/src/widgets/binding.dart:1164:13)
I/flutter ( 1190): #155    RendererBinding._handlePersistentFrameCallback (package:flutter/src/rendering/binding.dart:468:5)
I/flutter ( 1190): #156    SchedulerBinding._invokeFrameCallback (package:flutter/src/scheduler/binding.dart:1397:15)
I/flutter ( 1190): #157    SchedulerBinding.handleDrawFrame (package:flutter/src/scheduler/binding.dart:1318:9)
I/flutter ( 1190): #158    SchedulerBinding._handleDrawFrame (package:flutter/src/scheduler/binding.dart:1176:5)
I/flutter ( 1190): #162    _invoke (dart:ui/hooks.dart:314:10)
I/flutter ( 1190): #163    PlatformDispatcher._drawFrame (dart:ui/platform_dispatcher.dart:419:5)
I/flutter ( 1190): #164    _drawFrame (dart:ui/hooks.dart:283:31)

Code

Expanded(
  child: Column(
    mainAxisSize: MainAxisSize.min,
    children: [
      DatePageView(
        shrinkWrapInCrossAxis: true,
        builder: _buildDate,
        controller: _dateController,
      ),
      numberOfEventsThisWeek > 3 && (isWeekView || isDayView)
        ? const Padding(
          padding: EdgeInsets.symmetric(vertical: 2.0),
          child: SizedBox(
            height: 60,
            child: ScrollBarView(
              child: MultiDateEventHeader(),
            ),
          ),
        )
        : const Padding(
          padding: EdgeInsets.symmetric(vertical: 2.0),
          child: MultiDateEventHeader(),
        ),
      ],
    ),
  ),

Screenshot
flutter_01

Environment:

  • OS version: Android 14.0
  • Flutter version: 3.24.3
  • Package version: 1.0.0-alpha.14
  • Android Studio: LadyBug
@tauqeerkhattak tauqeerkhattak added the T: Fix Type: :bug: Bug Fixes label Oct 21, 2024
@tauqeerkhattak
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Also note that this issue only occurs when we add this line in main function.

debugPrintRebuildDirtyWidgets = true;

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