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Radio assertion failed if rebuild: RadioGroupPolicy can't be used for a radio group that allows multiple selection #175258

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#175654
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Radio assertion failed if rebuild: RadioGroupPolicy can't be used for a radio group that allows multiple selection#175258
#175654
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ksokolovskyi
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P2Important issues not at the top of the work lista: error messageError messages from the Flutter frameworkfound in release: 3.35Found to occur in 3.35found in release: 3.37Found to occur in 3.37frameworkflutter/packages/flutter repository. See also f: labels.has reproducible stepsThe issue has been confirmed reproducible and is ready to work onr: fixedIssue is closed as already fixed in a newer versionteam-frameworkOwned by Framework teamtriaged-frameworkTriaged by Framework teamworkaround availableThere is a workaround available to overcome the issue
@scribetw

Description

@scribetw
scribetw
opened on Sep 12, 2025

Steps to reproduce

  1. Run the attached example
  2. Press the FAB to trigger rebuilding

Expected results

The radio buttons become fewer

Actual results

Assertion failed.

It works if I use the deprecated way without RadioGroup.

Code sample

Code sample 
import 'package:flutter/material.dart';

void main() => runApp(const MyApp());

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

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      debugShowCheckedModeBanner: false,
      theme: ThemeData(colorSchemeSeed: Colors.blue),
      home: const MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  final String title;

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

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

class _MyHomePageState extends State<MyHomePage> {
  static const _plans = {1, 2, 3, 4, 5, 6, 7, 8, 9};

  int? _limitedPlan;
  int _plan = 9;

  void _incrementLimit() {
    setState(() {
      _limitedPlan = (_limitedPlan ?? 0) + 1;
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: Text(widget.title)),
      body: Center(
//         child: Column(
//             children: [
//               ..._plans
//                 .where((i) => _limitedPlan == null || i > _limitedPlan!)
//                 .map((i) => Radio(
//                   groupValue: _plan,
//                   onChanged: (val) => setState(() => _plan = val!),
//                   value: i,
//                 )),
//               Text(
//                 '$_limitedPlan',
//                 style: Theme.of(context).textTheme.headlineMedium,
//               ),
//             ],
//           ),
        child: RadioGroup(
          groupValue: _plan,
          onChanged: (val) => setState(() => _plan = val!),
          child: Column(
            children: [
              ..._plans
                .where((i) => _limitedPlan == null || i > _limitedPlan!)
                .map((i) => Radio(value: i)),
              Text(
                '$_limitedPlan',
                style: Theme.of(context).textTheme.headlineMedium,
              ),
            ],
          ),
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _incrementLimit,
        tooltip: 'Increment',
        child: const Icon(Icons.add),
      ),
    );
  }
}

Screenshots or Video

Screenshots / Video demonstration Image

Logs

Logs 
══╡ EXCEPTION CAUGHT BY WIDGETS LIBRARY ╞════════════════════════
The following assertion was thrown building
Radio<int>(dependencies: [InheritedCupertinoTheme,
_InheritedTheme, _LocalizationsScope-[GlobalKey#c916d],
_RadioGroupStateScope<int>], state: _RadioState<int>#612e9):
Assertion failed:
file:///opt/flutter/packages/flutter/lib/src/widgets/radio_group.dart:110:7
_debugCheckOnlySingleSelection()
"RadioGroupPolicy can't be used for a radio group that allows
multiple selection"

Widget creation tracking is currently disabled. Enabling it
enables improved error messages. It can be enabled by passing
`--track-widget-creation` to `flutter run` or `flutter test`.

When the exception was thrown, this was the stack
#2      _RadioGroupState.registerClient (package:flutter/src/widgets/radio_group.dart:110:7)
#3      RadioClient.registry= (package:flutter/src/widgets/radio_group.dart:270:16)
#4      _RawRadioState.didUpdateWidget (package:flutter/src/widgets/raw_radio.dart:170:5)
#5      StatefulElement.update (package:flutter/src/widgets/framework.dart:5893:55)
#6      Element.updateChild (package:flutter/src/widgets/framework.dart:3982:15)
#7      ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5747:16)
#8      StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:5884:11)
#9      Element.rebuild (package:flutter/src/widgets/framework.dart:5435:7)
#10     StatefulElement.update (package:flutter/src/widgets/framework.dart:5909:5)
#11     Element.updateChild (package:flutter/src/widgets/framework.dart:3982:15)
#12     ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5747:16)
#13     Element.rebuild (package:flutter/src/widgets/framework.dart:5435:7)
#14     ProxyElement.update (package:flutter/src/widgets/framework.dart:6051:5)
#15     Element.updateChild (package:flutter/src/widgets/framework.dart:3982:15)
#16     ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5747:16)
#17     Element.rebuild (package:flutter/src/widgets/framework.dart:5435:7)
#18     ProxyElement.update (package:flutter/src/widgets/framework.dart:6051:5)
#19     Element.updateChild (package:flutter/src/widgets/framework.dart:3982:15)
#20     ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5747:16)
#21     Element.rebuild (package:flutter/src/widgets/framework.dart:5435:7)
#22     ProxyElement.update (package:flutter/src/widgets/framework.dart:6051:5)
#23     Element.updateChild (package:flutter/src/widgets/framework.dart:3982:15)
#24     ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5747:16)
#25     Element.rebuild (package:flutter/src/widgets/framework.dart:5435:7)
#26     ProxyElement.update (package:flutter/src/widgets/framework.dart:6051:5)
#27     Element.updateChild (package:flutter/src/widgets/framework.dart:3982:15)
#28     ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5747:16)
#29     Element.rebuild (package:flutter/src/widgets/framework.dart:5435:7)
#30     StatelessElement.update (package:flutter/src/widgets/framework.dart:5797:5)
#31     Element.updateChild (package:flutter/src/widgets/framework.dart:3982:15)
#32     ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5747:16)
#33     Element.rebuild (package:flutter/src/widgets/framework.dart:5435:7)
#34     ProxyElement.update (package:flutter/src/widgets/framework.dart:6051:5)
#35     Element.updateChild (package:flutter/src/widgets/framework.dart:3982:15)
#36     ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5747:16)
#37     Element.rebuild (package:flutter/src/widgets/framework.dart:5435:7)
#38     StatelessElement.update (package:flutter/src/widgets/framework.dart:5797:5)
#39     Element.updateChild (package:flutter/src/widgets/framework.dart:3982:15)
#40     Element.updateChildren (package:flutter/src/widgets/framework.dart:4139:32)
#41     MultiChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:7202:17)
#42     Element.updateChild (package:flutter/src/widgets/framework.dart:3982:15)
#43     SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:7025:14)
#44     Element.updateChild (package:flutter/src/widgets/framework.dart:3982:15)
#45     SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:7025:14)
#46     Element.updateChild (package:flutter/src/widgets/framework.dart:3982:15)
#47     ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5747:16)
#48     Element.rebuild (package:flutter/src/widgets/framework.dart:5435:7)
#49     StatelessElement.update (package:flutter/src/widgets/framework.dart:5797:5)
#50     Element.updateChild (package:flutter/src/widgets/framework.dart:3982:15)
#51     SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:7025:14)
#52     Element.updateChild (package:flutter/src/widgets/framework.dart:3982:15)
#53     SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:7025:14)
#54     Element.updateChild (package:flutter/src/widgets/framework.dart:3982:15)
#55     ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5747:16)
#56     Element.rebuild (package:flutter/src/widgets/framework.dart:5435:7)
#57     StatelessElement.update (package:flutter/src/widgets/framework.dart:5797:5)
#58     Element.updateChild (package:flutter/src/widgets/framework.dart:3982:15)
#59     SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:7025:14)
#60     Element.updateChild (package:flutter/src/widgets/framework.dart:3982:15)
#61     SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:7025:14)
#62     Element.updateChild (package:flutter/src/widgets/framework.dart:3982:15)
#63     ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5747:16)
#64     Element.rebuild (package:flutter/src/widgets/framework.dart:5435:7)
#65     StatelessElement.update (package:flutter/src/widgets/framework.dart:5797:5)
#66     Element.updateChild (package:flutter/src/widgets/framework.dart:3982:15)
#67     ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5747:16)
#68     Element.rebuild (package:flutter/src/widgets/framework.dart:5435:7)
#69     ProxyElement.update (package:flutter/src/widgets/framework.dart:6051:5)
#70     Element.updateChild (package:flutter/src/widgets/framework.dart:3982:15)
#71     ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5747:16)
#72     Element.rebuild (package:flutter/src/widgets/framework.dart:5435:7)
#73     ProxyElement.update (package:flutter/src/widgets/framework.dart:6051:5)
#74     Element.updateChild (package:flutter/src/widgets/framework.dart:3982:15)
#75     ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5747:16)
#76     Element.rebuild (package:flutter/src/widgets/framework.dart:5435:7)
#77     ProxyElement.update (package:flutter/src/widgets/framework.dart:6051:5)
#78     Element.updateChild (package:flutter/src/widgets/framework.dart:3982:15)
#79     SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:7025:14)
#80     Element.updateChild (package:flutter/src/widgets/framework.dart:3982:15)
#81     SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:7025:14)
#82     Element.updateChild (package:flutter/src/widgets/framework.dart:3982:15)
#83     SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:7025:14)
#84     Element.updateChild (package:flutter/src/widgets/framework.dart:3982:15)
#85     SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:7025:14)
#86     Element.updateChild (package:flutter/src/widgets/framework.dart:3982:15)
#87     SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:7025:14)
#88     Element.updateChild (package:flutter/src/widgets/framework.dart:3982:15)
#89     SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:7025:14)
#90     Element.updateChild (package:flutter/src/widgets/framework.dart:3982:15)
#91     SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:7025:14)
#92     Element.updateChild (package:flutter/src/widgets/framework.dart:3982:15)
#93     SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:7025:14)
#94     Element.updateChild (package:flutter/src/widgets/framework.dart:3982:15)
#95     ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5747:16)
#96     StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:5884:11)
#97     Element.rebuild (package:flutter/src/widgets/framework.dart:5435:7)
#98     StatefulElement.update (package:flutter/src/widgets/framework.dart:5909:5)
#99     Element.updateChild (package:flutter/src/widgets/framework.dart:3982:15)
#100    SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:7025:14)
#101    Element.updateChild (package:flutter/src/widgets/framework.dart:3982:15)
#102    ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5747:16)
#103    Element.rebuild (package:flutter/src/widgets/framework.dart:5435:7)
#104    ProxyElement.update (package:flutter/src/widgets/framework.dart:6051:5)
#105    _InheritedNotifierElement.update (package:flutter/src/widgets/inherited_notifier.dart:108:11)
#106    Element.updateChild (package:flutter/src/widgets/framework.dart:3982:15)
#107    ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5747:16)
#108    StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:5884:11)
#109    Element.rebuild (package:flutter/src/widgets/framework.dart:5435:7)
#110    StatefulElement.update (package:flutter/src/widgets/framework.dart:5909:5)
#111    Element.updateChild (package:flutter/src/widgets/framework.dart:3982:15)
#112    SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:7025:14)
#113    Element.updateChild (package:flutter/src/widgets/framework.dart:3982:15)
#114    ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5747:16)
#115    Element.rebuild (package:flutter/src/widgets/framework.dart:5435:7)
#116    ProxyElement.update (package:flutter/src/widgets/framework.dart:6051:5)
#117    Element.updateChild (package:flutter/src/widgets/framework.dart:3982:15)
#118    ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5747:16)
#119    StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:5884:11)
#120    Element.rebuild (package:flutter/src/widgets/framework.dart:5435:7)
#121    StatefulElement.update (package:flutter/src/widgets/framework.dart:5909:5)
#122    Element.updateChild (package:flutter/src/widgets/framework.dart:3982:15)
#123    ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5747:16)
#124    StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:5884:11)
#125    Element.rebuild (package:flutter/src/widgets/framework.dart:5435:7)
#126    StatefulElement.update (package:flutter/src/widgets/framework.dart:5909:5)
#127    Element.updateChild (package:flutter/src/widgets/framework.dart:3982:15)
#128    SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:7025:14)
#129    Element.updateChild (package:flutter/src/widgets/framework.dart:3982:15)
#130    ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5747:16)
#131    StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:5884:11)
#132    Element.rebuild (package:flutter/src/widgets/framework.dart:5435:7)
#133    StatefulElement.update (package:flutter/src/widgets/framework.dart:5909:5)
#134    Element.updateChild (package:flutter/src/widgets/framework.dart:3982:15)
#135    ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5747:16)

Flutter Doctor output

Doctor output 
[✓] Flutter (Channel stable, 3.35.3, on Ubuntu 22.04.5 LTS 6.8.0-79-generic,
    locale en_US.UTF-8) [211ms]
    • Flutter version 3.35.3 on channel stable at
      /home/rudy/.asdf/installs/flutter/3.35.3
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision a402d9a437 (9 days ago), 2025-09-03 14:54:31 -0700
    • Engine revision ddf47dd3ff
    • Dart version 3.9.2
    • DevTools version 2.48.0
    • Feature flags: enable-web, enable-linux-desktop, enable-macos-desktop,
      enable-windows-desktop, enable-android, enable-ios, cli-animations,
      enable-lldb-debugging

[✓] Android toolchain - develop for Android devices (Android SDK version 36.0.0)
    [1,765ms]
    • Android SDK at /home/rudy/Android/Sdk
    • Emulator version 36.1.9.0 (build_id 13823996) (CL:N/A)
    • Platform android-36, build-tools 36.0.0
    • ANDROID_HOME = /home/rudy/Android/Sdk
    • Java binary at:
      /home/rudy/.local/share/JetBrains/Toolbox/apps/android-studio/jbr/bin/java
      This is the JDK bundled with the latest Android Studio installation on
      this machine.
      To manually set the JDK path, use: `flutter config
      --jdk-dir="path/to/jdk"`.
    • Java version OpenJDK Runtime Environment (build 21.0.7+-13880790-b1038.58)
    • All Android licenses accepted.

[✓] Chrome - develop for the web [179ms]
    • Chrome at google-chrome

[✓] Linux toolchain - develop for Linux desktop [602ms]
    • Ubuntu clang version 14.0.0-1ubuntu1.1
    • cmake version 3.22.1
    • ninja version 1.10.1
    • pkg-config version 0.29.2
    • GL_EXT_framebuffer_blit: no
    • GL_EXT_texture_format_BGRA8888: no

[✓] Android Studio (version 2025.1.3) [176ms]
    • Android Studio at
      /home/rudy/.local/share/JetBrains/Toolbox/apps/android-studio
    • Flutter plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/9212-flutter
    • Dart plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/6351-dart
    • android-studio-dir =
      /home/rudy/.local/share/JetBrains/Toolbox/apps/android-studio
    • Java version OpenJDK Runtime Environment (build 21.0.7+-13880790-b1038.58)

[✓] IntelliJ IDEA Ultimate Edition (version 2025.2) [175ms]
    • IntelliJ at /snap/intellij-idea-ultimate/644
    • Flutter plugin version 87.1
    • Dart plugin version 252.25557.23

[✓] VS Code (version 1.103.2) [8ms]
    • VS Code at /usr/share/code
    • Flutter extension version 3.118.0

[✓] Connected device (3 available) [162ms]
    • sdk gphone64 x86 64 (mobile) • emulator-5554 • android-x64    • Android 16
      (API 36) (emulator)
    • Linux (desktop)              • linux         • linux-x64      • Ubuntu
      22.04.5 LTS 6.8.0-79-generic
    • Chrome (web)                 • chrome        • web-javascript • Google
      Chrome 140.0.7339.127

[✓] Network resources [1,017ms]
    • All expected network resources are available.

• No issues found!

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P2Important issues not at the top of the work lista: error messageError messages from the Flutter frameworkfound in release: 3.35Found to occur in 3.35found in release: 3.37Found to occur in 3.37frameworkflutter/packages/flutter repository. See also f: labels.has reproducible stepsThe issue has been confirmed reproducible and is ready to work onr: fixedIssue is closed as already fixed in a newer versionteam-frameworkOwned by Framework teamtriaged-frameworkTriaged by Framework teamworkaround availableThere is a workaround available to overcome the issue

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