When the exception was thrown, this was the stack:
#0 ChartPoint.labelRect (package:syncfusion_flutter_charts/src/circular_chart/renderer/chart_point.dart)
#1 renderCircularDataLabel (package:syncfusion_flutter_charts/src/circular_chart/renderer/data_label_renderer.dart:585:33)
#2 _CircularDataLabelPainter.paint (package:syncfusion_flutter_charts/src/circular_chart/renderer/data_label_renderer.dart:144:9)
#3 RenderCustomPaint._paintWithPainter (package:flutter/src/rendering/custom_paint.dart:573:13)
#4 RenderCustomPaint.paint (package:flutter/src/rendering/custom_paint.dart:615:7)
#5 RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:3059:7)
#6 PaintingContext.paintChild (package:flutter/src/rendering/object.dart:253:13)
#7 RenderProxyBoxMixin.paint (package:flutter/src/rendering/proxy_box.dart:146:15)
#8 RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:3059:7)
#9 PaintingContext._repaintCompositedChild (package:flutter/src/rendering/object.dart:169:11)
#10 PaintingContext.repaintCompositedChild (package:flutter/src/rendering/object.dart:112:5)
#11 PipelineOwner.flushPaint (package:flutter/src/rendering/object.dart:1147:31)
#12 RendererBinding.drawFrame (package:flutter/src/rendering/binding.dart:494:19)
#13 WidgetsBinding.drawFrame (package:flutter/src/widgets/binding.dart:905:13)
#14 RendererBinding._handlePersistentFrameCallback (package:flutter/src/rendering/binding.dart:358:5)
#15 SchedulerBinding._invokeFrameCallback (package:flutter/src/scheduler/binding.dart:1284:15)
#16 SchedulerBinding.handleDrawFrame (package:flutter/src/scheduler/binding.dart:1214:9)
#17 SchedulerBinding.scheduleWarmUpFrame. (package:flutter/src/scheduler/binding.dart:939:7)
#21 _RawReceivePort._handleMessage (dart:isolate-patch/isolate_patch.dart:189:12)
(elided 3 frames from class _Timer and dart:async-patch)
The following RenderObject was being processed when the exception was fired: RenderCustomPaint#ec66f relayoutBoundary=up2
... parentData: (can use size)
... constraints: BoxConstraints(0.0<=w<=392.7, 0.0<=h<=314.0)
... size: Size(0.0, 0.0)
... painter: _CircularDataLabelPainter#b7958(ValueNotifier#8e95c(42))
RenderObject: RenderCustomPaint#ec66f relayoutBoundary=up2
parentData: (can use size)
constraints: BoxConstraints(0.0<=w<=392.7, 0.0<=h<=314.0)
size: Size(0.0, 0.0)
painter: _CircularDataLabelPainter#b7958(ValueNotifier#8e95c(42))