Bug: QRImage disappears on eyeball customisation

[ShimronAlakkal]

Describe the bug
When using the eyeStyleing, the existing qr image disappears.

Code

 Center(
              child: QrImage(
                  gapless: false,
                  semanticsLabel: 'Proud Zellow User',
                  data: baseUrl + FirebaseAuth.instance.currentUser!.uid,
                  dataModuleStyle: QrDataModuleStyle(
                    dataModuleShape: QrDataModuleShape.circle,
                    color: ColorPalette().secondaryTextColor,
                  ),
                  eyeStyle: QrEyeStyle(eyeShape: QrEyeShape.circle),
                  size: MediaQuery.of(context).size.height * 0.35),
            ),

Error on debug

The following _CastError was thrown during paint():
Null check operator used on a null value

The relevant error-causing widget was
QrImage

The following RenderObject was being processed when the exception was fired: RenderCustomPaint#c2ad7
RenderObject: RenderCustomPaint#c2ad7
    parentData: offset=Offset(10.0, 10.0) (can use size)
    constraints: BoxConstraints(w=238.1, h=238.1)
    size: Size(238.1, 238.1)
    painter: QrPainter#0a4bb()

[BraveEvidence]

This might help https://www.youtube.com/watch?v=9ADSWmPCJMg&list=PLQhQEGkwKZUqZC2QAp_u4ZAzqpsCCRvmM&index=6 https://www.youtube.com/watch?v=ZRUE1i15TYw&list=PLQhQEGkwKZUqZC2QAp_u4ZAzqpsCCRvmM&index=7

[Edgar-P-yan]

Having the same issue while developing a macOS desktop app, i also successfully reproduced the same bug in a new empty project without any other dependencies. The issue only appears if i specify either eyeStyle or dataModuleStyle. Without those options the QR code shows correctly.
Reproducing code. The QR code in this case shows only the 3 corder big squares, the rest is just empty:

import 'package:flutter/material.dart';
import 'package:qr_flutter/qr_flutter.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        colorScheme: ColorScheme.fromSeed(seedColor: Colors.deepPurple),
        useMaterial3: true,
      ),
      home: const MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({super.key, required this.title});

  final String title;

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  int _counter = 0;

  void _incrementCounter() {
    setState(() {
      _counter++;
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        backgroundColor: Theme.of(context).colorScheme.inversePrimary,
        title: Text(widget.title),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            const Text(
              'You have pushed the button this many times:',
            ),
            Text(
              '$_counter',
              style: Theme.of(context).textTheme.headlineMedium,
            ),
            QrImageView(
              data: 'placeholder',
              version: QrVersions.auto,
              size: 300,
              gapless: true,
              dataModuleStyle: const QrDataModuleStyle(
                dataModuleShape: QrDataModuleShape.circle,
              ),
            ),
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _incrementCounter,
        tooltip: 'Increment',
        child: const Icon(Icons.add),
      ),
    );
  }
}

════════ Exception caught by rendering library ═════════════════════════════════
Null check operator used on a null value
The relevant error-causing widget was:
════════════════════════════════════════════════════════════════════════════════

════════ Exception caught by rendering library ═════════════════════════════════
Null check operator used on a null value
The relevant error-causing widget was:
════════════════════════════════════════════════════════════════════════════════

════════ Exception caught by rendering library ═════════════════════════════════
Null check operator used on a null value
The relevant error-causing widget was:
════════════════════════════════════════════════════════════════════════════════

════════ Exception caught by rendering library ═════════════════════════════════
The following _TypeError was thrown during paint():
Null check operator used on a null value

The relevant error-causing widget was:
    QrImageView QrImageView:file:///REDACTED/lib/screens/auth/auth_screen.dart:281:23

When the exception was thrown, this was the stack:
#0      QrPainter._drawFinderPatternItem (package:qr_flutter/src/qr_painter.dart:358:63)
#1      QrPainter.paint (package:qr_flutter/src/qr_painter.dart:207:5)
#2      RenderCustomPaint._paintWithPainter (package:flutter/src/rendering/custom_paint.dart:588:13)
#3      RenderCustomPaint.paint (package:flutter/src/rendering/custom_paint.dart:630:7)
#4      RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:3239:7)
#5      PaintingContext.paintChild (package:flutter/src/rendering/object.dart:250:13)
#6      RenderShiftedBox.paint (package:flutter/src/rendering/shifted_box.dart:74:15)
#7      RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:3239:7)
#8      PaintingContext.paintChild (package:flutter/src/rendering/object.dart:250:13)
#9      _RenderColoredBox.paint (package:flutter/src/widgets/basic.dart:7826:15)
#10     RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:3239:7)
#11     PaintingContext.paintChild (package:flutter/src/rendering/object.dart:250:13)
#12     RenderProxyBoxMixin.paint (package:flutter/src/rendering/proxy_box.dart:130:13)
#13     RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:3239:7)
#14     PaintingContext.paintChild (package:flutter/src/rendering/object.dart:250:13)
#15     RenderProxyBoxMixin.paint (package:flutter/src/rendering/proxy_box.dart:130:13)
#16     RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:3239:7)
#17     PaintingContext.paintChild (package:flutter/src/rendering/object.dart:250:13)
#18     _RenderLayoutBuilder.paint (package:flutter/src/widgets/layout_builder.dart:356:15)
#19     RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:3239:7)
#20     PaintingContext.paintChild (package:flutter/src/rendering/object.dart:250:13)
#21     RenderBoxContainerDefaultsMixin.defaultPaint (package:flutter/src/rendering/box.dart:3158:15)
#22     RenderFlex.paint (package:flutter/src/rendering/flex.dart:1014:7)
#23     RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:3239:7)
#24     PaintingContext.paintChild (package:flutter/src/rendering/object.dart:250:13)
#25     RenderProxyBoxMixin.paint (package:flutter/src/rendering/proxy_box.dart:130:13)
#26     RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:3239:7)
#27     PaintingContext.paintChild (package:flutter/src/rendering/object.dart:250:13)
#28     RenderShiftedBox.paint (package:flutter/src/rendering/shifted_box.dart:74:15)
#29     RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:3239:7)
#30     PaintingContext.paintChild (package:flutter/src/rendering/object.dart:250:13)
#31     RenderBoxContainerDefaultsMixin.defaultPaint (package:flutter/src/rendering/box.dart:3158:15)
#32     RenderCustomMultiChildLayoutBox.paint (package:flutter/src/rendering/custom_layout.dart:409:5)
#33     RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:3239:7)
#34     PaintingContext.paintChild (package:flutter/src/rendering/object.dart:250:13)
#35     RenderProxyBoxMixin.paint (package:flutter/src/rendering/proxy_box.dart:130:13)
#36     _RenderInkFeatures.paint (package:flutter/src/material/material.dart:662:11)
#37     RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:3239:7)
#38     PaintingContext.paintChild (package:flutter/src/rendering/object.dart:250:13)
#39     RenderProxyBoxMixin.paint (package:flutter/src/rendering/proxy_box.dart:130:13)
#40     RenderPhysicalModel.paint.<anonymous closure> (package:flutter/src/rendering/proxy_box.dart:2033:15)
#41     PaintingContext.pushClipRRect (package:flutter/src/rendering/object.dart:575:14)
#42     RenderPhysicalModel.paint (package:flutter/src/rendering/proxy_box.dart:2020:21)
#43     RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:3239:7)
#44     PaintingContext.paintChild (package:flutter/src/rendering/object.dart:250:13)
#45     RenderBoxContainerDefaultsMixin.defaultPaint (package:flutter/src/rendering/box.dart:3158:15)
#46     RenderCustomMultiChildLayoutBox.paint (package:flutter/src/rendering/custom_layout.dart:409:5)
#47     RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:3239:7)
#48     PaintingContext.paintChild (package:flutter/src/rendering/object.dart:250:13)
#49     RenderProxyBoxMixin.paint (package:flutter/src/rendering/proxy_box.dart:130:13)
#50     _RenderInkFeatures.paint (package:flutter/src/material/material.dart:662:11)
#51     RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:3239:7)
#52     PaintingContext.paintChild (package:flutter/src/rendering/object.dart:250:13)
#53     RenderProxyBoxMixin.paint (package:flutter/src/rendering/proxy_box.dart:130:13)
#54     RenderPhysicalModel.paint.<anonymous closure> (package:flutter/src/rendering/proxy_box.dart:2033:15)
#55     PaintingContext.pushClipRRect (package:flutter/src/rendering/object.dart:575:14)
#56     RenderPhysicalModel.paint (package:flutter/src/rendering/proxy_box.dart:2020:21)
#57     RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:3239:7)
#58     PaintingContext.paintChild (package:flutter/src/rendering/object.dart:250:13)
#59     RenderProxyBoxMixin.paint (package:flutter/src/rendering/proxy_box.dart:130:13)
#60     RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:3239:7)
#61     PaintingContext.paintChild (package:flutter/src/rendering/object.dart:250:13)
#62     RenderProxyBoxMixin.paint (package:flutter/src/rendering/proxy_box.dart:130:13)
#63     RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:3239:7)
#64     PaintingContext._repaintCompositedChild (package:flutter/src/rendering/object.dart:166:11)
#65     PaintingContext.repaintCompositedChild (package:flutter/src/rendering/object.dart:109:5)
#66     PipelineOwner.flushPaint (package:flutter/src/rendering/object.dart:1182:31)
#67     PipelineOwner.flushPaint (package:flutter/src/rendering/object.dart:1192:15)
#68     RendererBinding.drawFrame (package:flutter/src/rendering/binding.dart:579:23)
#69     WidgetsBinding.drawFrame (package:flutter/src/widgets/binding.dart:1138:13)
#70     RendererBinding._handlePersistentFrameCallback (package:flutter/src/rendering/binding.dart:443:5)
#71     SchedulerBinding._invokeFrameCallback (package:flutter/src/scheduler/binding.dart:1392:15)
#72     SchedulerBinding.handleDrawFrame (package:flutter/src/scheduler/binding.dart:1313:9)
#73     SchedulerBinding.scheduleWarmUpFrame.<anonymous closure> (package:flutter/src/scheduler/binding.dart:1035:9)
#74     PlatformDispatcher.scheduleWarmUpFrame.<anonymous closure> (dart:ui/platform_dispatcher.dart:837:16)
#78     _RawReceivePort._handleMessage (dart:isolate-patch/isolate_patch.dart:184:12)
(elided 3 frames from class _Timer and dart:async-patch)

The following RenderObject was being processed when the exception was fired: RenderCustomPaint#ca91d
    parentData: offset=Offset(10.0, 10.0) (can use size)
    constraints: BoxConstraints(w=280.0, h=280.0)
    size: Size(280.0, 280.0)
    painter: QrPainter#5c6c2()
RenderObject: RenderCustomPaint#ca91d
    parentData: offset=Offset(10.0, 10.0) (can use size)
    constraints: BoxConstraints(w=280.0, h=280.0)
    size: Size(280.0, 280.0)
    painter: QrPainter#5c6c2()
════════════════════════════════════════════════════════════════════════════════
Reloaded 1 of 3657 libraries in 477ms (compile: 34 ms, reload: 274 ms, reassemble: 161 ms).

════════ Exception caught by rendering library ═════════════════════════════════
Null check operator used on a null value
The relevant error-causing widget was:
════════════════════════════════════════════════════════════════════════════════

════════ Exception caught by rendering library ═════════════════════════════════
Null check operator used on a null value
The relevant error-causing widget was:
════════════════════════════════════════════════════════════════════════════════