Fl_chart: Error: The getter 'spot' was called on null

Created on 2 Aug 2019  ยท  2Comments  ยท  Source: imaNNeoFighT/fl_chart

Getting the below error every time the charts are drawn.

I/flutter (18757): โ•โ•โ•ก EXCEPTION CAUGHT BY RENDERING LIBRARY โ•žโ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•
I/flutter (18757): The following NoSuchMethodError was thrown during paint():
I/flutter (18757): The getter 'spot' was called on null.
I/flutter (18757): Receiver: null
I/flutter (18757): Tried calling: spot
I/flutter (18757): 
I/flutter (18757): When the exception was thrown, this was the stack:
I/flutter (18757): #0      Object.noSuchMethod (dart:core-patch/object_patch.dart:50:5)
I/flutter (18757): #1      defaultTitlesStyle.<anonymous closure> (package:fl_chart/src/chart/base/axis_chart/axis_chart_data.dart:136:45)
I/flutter (18757): #2      MappedListIterable.elementAt (dart:_internal/iterable.dart:414:29)
I/flutter (18757): #3      ListIterable.toList (dart:_internal/iterable.dart:219:19)
I/flutter (18757): #4      defaultTitlesStyle (package:fl_chart/src/chart/base/axis_chart/axis_chart_data.dart:148:6)
I/flutter (18757): #5      AxisChartPainter.drawTouchTooltip (package:fl_chart/src/chart/base/axis_chart/axis_chart_painter.dart:128:56)
I/flutter (18757): #6      BarChartPainter.paint (package:fl_chart/src/chart/bar_chart/bar_chart_painter.dart:41:11)
I/flutter (18757): #7      RenderCustomPaint._paintWithPainter (package:flutter/src/rendering/custom_paint.dart:528:13)
I/flutter (18757): #8      RenderCustomPaint.paint (package:flutter/src/rendering/custom_paint.dart:566:7)
I/flutter (18757): #9      RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:2089:7)
I/flutter (18757): #10     PaintingContext.paintChild (package:flutter/src/rendering/object.dart:172:13)
I/flutter (18757): #11     _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.paint (package:flutter/src/rendering/proxy_box.dart:123:15)
I/flutter (18757): #12     RenderPointerListener.paint (package:flutter/src/rendering/proxy_box.dart:2669:11)
I/flutter (18757): #13     RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:2089:7)
I/flutter (18757): #14     PaintingContext.paintChild (package:flutter/src/rendering/object.dart:172:13)
I/flutter (18757): #15     _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.paint (package:flutter/src/rendering/proxy_box.dart:123:15)
I/flutter (18757): #16     RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:2089:7)
I/flutter (18757): #17     PaintingContext.paintChild (package:flutter/src/rendering/object.dart:172:13)
I/flutter (18757): #18     _RenderFlex&RenderBox&ContainerRenderObjectMixin&RenderBoxContainerDefaultsMixin.defaultPaint (package:flutter/src/rendering/box.dart:2509:15)
I/flutter (18757): #19     RenderFlex.paint (package:flutter/src/rendering/flex.dart:947:7)
I/flutter (18757): #20     RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:2089:7)
I/flutter (18757): #21     PaintingContext.paintChild (package:flutter/src/rendering/object.dart:172:13)
I/flutter (18757): #22     RenderShiftedBox.paint (package:flutter/src/rendering/shifted_box.dart:70:15)
I/flutter (18757): #23     RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:2089:7)
I/flutter (18757): #24     PaintingContext.paintChild (package:flutter/src/rendering/object.dart:172:13)
I/flutter (18757): #25     _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.paint (package:flutter/src/rendering/proxy_box.dart:123:15)
I/flutter (18757): #26     RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:2089:7)
I/flutter (18757): #27     PaintingContext.paintChild (package:flutter/src/rendering/object.dart:172:13)
I/flutter (18757): #28     _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.paint (package:flutter/src/rendering/proxy_box.dart:123:15)
I/flutter (18757): #29     _RenderInkFeatures.paint (package:flutter/src/material/material.dart:510:11)
I/flutter (18757): #30     RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:2089:7)
I/flutter (18757): #31     PaintingContext.paintChild (package:flutter/src/rendering/object.dart:172:13)
I/flutter (18757): #32     _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.paint (package:flutter/src/rendering/proxy_box.dart:123:15)
I/flutter (18757): #33     RenderCustomPaint.paint (package:flutter/src/rendering/custom_paint.dart:569:11)
I/flutter (18757): #34     RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:2089:7)
I/flutter (18757): #35     PaintingContext.paintChild (package:flutter/src/rendering/object.dart:172:13)
I/flutter (18757): #36     _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.paint (package:flutter/src/rendering/proxy_box.dart:123:15)
I/flutter (18757): #37     PaintingContext.pushLayer (package:flutter/src/rendering/object.dart:369:12)
I/flutter (18757): #38     RenderPhysicalShape.paint (package:flutter/src/rendering/proxy_box.dart:1818:15)
I/flutter (18757): #39     RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:2089:7)
I/flutter (18757): #40     PaintingContext.paintChild (package:flutter/src/rendering/object.dart:172:13)
I/flutter (18757): #41     RenderShiftedBox.paint (package:flutter/src/rendering/shifted_box.dart:70:15)
I/flutter (18757): #42     RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:2089:7)
I/flutter (18757): #43     PaintingContext.paintChild (package:flutter/src/rendering/object.dart:172:13)
I/flutter (18757): #44     _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.paint (package:flutter/src/rendering/proxy_box.dart:123:15)
I/flutter (18757): #45     RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:2089:7)
I/flutter (18757): #46     PaintingContext.paintChild (package:flutter/src/rendering/object.dart:172:13)
I/flutter (18757): #47     _RenderFlex&RenderBox&ContainerRenderObjectMixin&RenderBoxContainerDefaultsMixin.defaultPaint (package:flutter/src/rendering/box.dart:2509:15)
I/flutter (18757): #48     RenderFlex.paint (package:flutter/src/rendering/flex.dart:947:7)
I/flutter (18757): #49     RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:2089:7)
I/flutter (18757): #50     PaintingContext.paintChild (package:flutter/src/rendering/object.dart:172:13)
I/flutter (18757): #51     _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.paint (package:flutter/src/rendering/proxy_box.dart:123:15)
I/flutter (18757): #52     RenderDecoratedBox.paint (package:flutter/src/rendering/proxy_box.dart:1953:11)
I/flutter (18757): #53     RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:2089:7)
I/flutter (18757): #54     PaintingContext.paintChild (package:flutter/src/rendering/object.dart:172:13)
I/flutter (18757): #55     _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.paint (package:flutter/src/rendering/proxy_box.dart:123:15)
I/flutter (18757): #56     RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:2089:7)
I/flutter (18757): #57     PaintingContext._repaintCompositedChild (package:flutter/src/rendering/object.dart:127:11)
I/flutter (18757): #58     PaintingContext.repaintCompositedChild (package:flutter/src/rendering/object.dart:95:5)
I/flutter (18757): #59     PipelineOwner.flushPaint (package:flutter/src/rendering/object.dart:858:29)
I/flutter (18757): #60     _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding&PaintingBinding&SemanticsBinding&RendererBinding.drawFrame (package:flutter/src/rendering/binding.dart:348:19)
I/flutter (18757): #61     _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding&PaintingBinding&SemanticsBinding&RendererBinding&WidgetsBinding.drawFrame (package:flutter/src/widgets/binding.dart:701:13)
I/flutter (18757): #62     _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding&PaintingBinding&SemanticsBinding&RendererBinding._handlePersistentFrameCallback (package:flutter/src/rendering/binding.dart:285:5)
I/flutter (18757): #63     _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding._invokeFrameCallback (package:flutter/src/scheduler/binding.dart:1016:15)
I/flutter (18757): #64     _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding.handleDrawFrame (package:flutter/src/scheduler/binding.dart:958:9)
I/flutter (18757): #65     _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding._handleDrawFrame (package:flutter/src/scheduler/binding.dart:874:5)
I/flutter (18757): #69     _invoke (dart:ui/hooks.dart:236:10)
I/flutter (18757): #70     _drawFrame (dart:ui/hooks.dart:194:3)
I/flutter (18757): (elided 3 frames from package dart:async)
I/flutter (18757): 
I/flutter (18757): The following RenderObject was being processed when the exception was fired: RenderCustomPaint#374c4:
I/flutter (18757):   creator: CustomPaint โ† Listener โ† _GestureSemantics โ† RawGestureDetector โ† GestureDetector โ† FlChart
I/flutter (18757):     โ† Expanded โ† Column โ† Padding โ† Semantics โ† DefaultTextStyle โ† AnimatedDefaultTextStyle โ† โ‹ฏ
I/flutter (18757):   parentData: <none> (can use size)
I/flutter (18757):   constraints: BoxConstraints(w=323.2, h=116.2)
I/flutter (18757):   size: Size(323.2, 116.2)
I/flutter (18757): This RenderObject has no descendants.

Also, below is the code which I am using to draw the chart.

FlChart(
  chart: BarChart(
    BarChartData(
      barGroups: barChartGroupsData,
      titlesData: FlTitlesData(
        bottomTitles: SideTitles(
          showTitles: false,
        ),
        leftTitles: SideTitles(
          margin: 0.0,
          showTitles: false,
          getTitles: (tileIndex) {
            return tileIndex.toInt().toString();
          }
        )
      ),
      alignment: BarChartAlignment.spaceEvenly,
      backgroundColor: AppColors.white,
      borderData: FlBorderData(
        show: false
      ),
      gridData: FlGridData(
        drawHorizontalGrid: true,
      ),
      barTouchData: BarTouchData(
        enabled: false,
        touchTooltipData: TouchTooltipData(),
        allowTouchBarBackDraw: false,
      )
    ),
  ),
),

Any idea as to why this might be occuring? Thanks in advance for your help.
Also, many thanks for creating this awesome package!

bug
Source
picture thebuggycoder

All 2 comments

touchTooltipData is the reason.

touchTooltipData: TouchTooltipData(
                          tooltipBgColor: Colors.blueGrey,
                          getTooltipItems: (touchedSpots) {
                            return touchedSpots.map((touchedSpot) {
                              if (touchedSpot?.spot == null) { return null; }  // ***** this is the key code
                              return TooltipItem('***' + '\n' + touchedSpot.spot.y.toString(), TextStyle(color: Colors.yellow));
                            }).toList();
                          }
                        )
515783034 picture 515783034 on 14 Aug 2019
👍1

fixed in 0.2.0, the problem is that you forgot to set x in BarChartGroupData, now it is required

imaNNeoFighT picture imaNNeoFighT on 20 Aug 2019
👍1
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