[material/menu_anchor.dart] Internal menu controller is not created when external menu controller is removed. #176374
Description
Steps to reproduce
Just came across a bug I introduced. I'll get the fix in ASAP
- Run example
- Tap "Toggle Controller"
Expected results
An internal menu controller should be created and no error should be thrown.
Actual results
Throws "Null check operator used on a null value" because an internal menu controller is not created.
Code sample
Code sample
import 'package:flutter/material.dart';
void main(List<String> args) {
runApp(const App());
}
class App extends StatefulWidget {
const App({super.key});
@override
State<App> createState() => _AppState();
}
class _AppState extends State<App> {
final MenuController menuController = MenuController();
bool isControllerAttached = true;
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
home: Material(
child: MenuAnchor(
controller: isControllerAttached ? menuController : null,
menuChildren: const <Widget>[
Text('Item'),
],
builder: (BuildContext context, MenuController controller, Widget? child) {
return Center(
child: ElevatedButton(
onPressed: () {
setState(() {
isControllerAttached = !isControllerAttached;
});
},
child: const Text('Toggle Controller'),
),
);
},
),
),
);
}
}
Screenshots or Video
Screenshots / Video demonstration
[Upload media here]
Logs
Logs
[Paste your logs here]Flutter Doctor output
Doctor output
[✓] Flutter (Channel stable, 3.35.5, on macOS 15.5 24F74 darwin-arm64, locale en-US) [242ms]
• Flutter version 3.35.5 on channel stable at /Users/davidhicks/fvm/versions/stable
• Upstream repository https://github.com/flutter/flutter.git
• Framework revision ac4e799d23 (5 days ago), 2025-09-26 12:05:09 -0700
• Engine revision d3d45dcf25
• 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 35.0.0) [1,754ms]
• Android SDK at /Users/davidhicks/Library/Android/sdk
• Emulator version 35.4.9.0 (build_id 13025442) (CL:N/A)
• Platform android-36, build-tools 35.0.0
• ANDROID_HOME = /Users/davidhicks/Library/Android/sdk
• Java binary at: /Library/Java/JavaVirtualMachines/jdk-17.0.2.jdk/Contents/Home/bin/java
This JDK is specified in your Flutter configuration.
To change the current JDK, run: `flutter config --jdk-dir="path/to/jdk"`.
• Java version Java(TM) SE Runtime Environment (build 17.0.2+8-LTS-86)
! Some Android licenses not accepted. To resolve this, run: flutter doctor --android-licenses
[✓] Xcode - develop for iOS and macOS (Xcode 16.4) [1,129ms]
• Xcode at /Applications/Xcode.app/Contents/Developer
• Build 16F6
• CocoaPods version 1.16.2
[✓] Chrome - develop for the web [9ms]
• Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome
[✓] Android Studio (version 2024.3) [8ms]
• Android Studio at /Applications/Android Studio.app/Contents
• 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
• Java version OpenJDK Runtime Environment (build 21.0.6+-13355223-b631.42)
[✓] VS Code (version 1.103.2) [7ms]
• VS Code at /Applications/Visual Studio Code.app/Contents
• Flutter extension version 3.120.0
[✓] Connected device (3 available) [10.0s]
• iPhone 16 Pro (mobile) • 202ED8C0-7DDC-4EB3-91F7-A3C2180AE01E • ios • com.apple.CoreSimulator.SimRuntime.iOS-18-5 (simulator)
• macOS (desktop) • macos • darwin-arm64 • macOS 15.5 24F74 darwin-arm64
• Chrome (web) • chrome • web-javascript • Google Chrome 140.0.7339.214
! Error: Browsing on the local area network for David’s iPhone. Ensure the device is unlocked and attached with a cable or associated with the same local area network as this
Mac.
The device must be opted into Developer Mode to connect wirelessly. (code -27)
[✓] Network resources [189ms]
• All expected network resources are available.
! Doctor found issues in 1 category.```
</details>