The following assertion was thrown during paint() - Flutter Web

[jaxnz]

Hi, I am getting the following exception when the widget builds.

The PieChartSection won't create if there is no value, so not sure whats happening

════════ Exception caught by rendering library ═════════════════════════════════════════════════════
The following assertion was thrown during paint():
Assertion failed: org-dartlang-sdk:///flutter_web_sdk/lib/_engine/engine/validators.dart:11:7
!(rect.left.isNaN ||
          rect.right.isNaN ||
          rect.top.isNaN ||
          rect.bottom.isNaN)
"Rect argument contained a NaN value."

The relevant error-causing widget was: 
  PieChart file:///C:/Users/<User>/AndroidStudioProjects/<Project>/lib/views/admin/widgets/charts/enquiries_chart.dart:51:46
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 214:49  throw_
C:/b/s/w/ir/cache/builder/src/out/host_debug/dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 24:3    assertFailed
C:/b/s/w/ir/cache/builder/src/out/host_debug/flutter_web_sdk/lib/_engine/engine/validators.dart 14:15                      rectIsValid
C:/b/s/w/ir/cache/builder/src/out/host_debug/flutter_web_sdk/lib/ui/src/ui/canvas.dart 650:12                              drawArc
packages/fl_chart/src/chart/pie_chart/pie_chart_painter.dart 97:13                                                         [_drawSections]
...
The following RenderObject was being processed when the exception was fired: RenderCustomPaint#a1fab relayoutBoundary=up15
...  parentData: <none> (can use size)
...  constraints: BoxConstraints(0.0<=w<=1145.0, h=442.0)
...  size: Size(923.3, 442.0)
RenderObject: RenderCustomPaint#a1fab relayoutBoundary=up15
  parentData: <none> (can use size)
  constraints: BoxConstraints(0.0<=w<=1145.0, h=442.0)
  size: Size(923.3, 442.0)

Code:

class EnquiryPieChart extends StatelessWidget {
  final List<EnquiryData> enquiryData;
  EnquiryPieChart({this.enquiryData});

  @override
  Widget build(BuildContext context) {
    List<PieChartSectionData> pieSections = [];

    enquiryData.forEach((enquiry) {
      if (pieSections.where((section) => section.title == enquiry.hearAboutUs).toList().isEmpty) {
        int count = enquiryData.where((how) => how.hearAboutUs == enquiry.hearAboutUs).length;
        pieSections.add(PieChartSectionData(
          title: enquiry.hearAboutUs,
          value: count.toDouble(),
          radius: 60,
        ));
      }
    });
    return pieSections.isEmpty ? Loading() : PieChart(PieChartData(sections: pieSections));
  }
}

Flutter Version:

Flutter 1.19.0-4.1.pre • channel beta • https://github.com/flutter/flutter.git
Framework • revision f994b76974 (3 weeks ago) • 2020-06-09 15:53:13 -0700
Engine • revision 9a28c3bcf4
Tools • Dart 2.9.0 (build 2.9.0-14.1.beta)

[TavernierAlicia]

It seems the centerSpaceRadius value is mandatory.
In your return PieChart :
return PieChart( PieChartData( centerSpaceRadius: 0, // more settings ) )

[jaxnz]

@TavernierAlicia - worked perfectly! I'm thinking centerSpaceRadius may need @required?

[imaNNeo]

Yes, we need @required for it.
I will reopen it to follow it up.
Thanks for letting us know.

[imaNNeo]

Set default centerSpaceRadius to double.infinity in PieChartData.
Check it out in the 0.11.0 version.
Thanks for reporting!