[firebase_remote_config]: When restarting the app, firebase_remote_config listener stream subscription is not canceled, resulting in duplicate calls.

[kimdindoo]

Is there an existing issue for this?

• I have searched the existing issues.

Which plugins are affected?

Remote Config

Which platforms are affected?

iOS

Description

When restarting the app, firebase_remote_config listener stream subscription is not canceled, resulting in duplicate calls.

Reproducing the issue

  void _registerRemoteConfigListener() {
    if (_remoteConfigSubscription != null) return; // 이미 등록되어 있으면 재등록 방지
    final remoteConfig = getIt.get<FirebaseRemoteConfig>();
    _remoteConfigSubscription = remoteConfig.onConfigUpdated.listen((event) async {
      await remoteConfig.activate();

      debugPrint('event: ${event}');
      debugPrint('event.updatedKeys: ${event.updatedKeys}');

      serverVersion = GlobalVars.platformOS == 'iPhone'
          ? remoteConfig.getString('Test_Flutter_IOS_BuildNumber')
          : remoteConfig.getString('Test_Flutter_AOS_BuildNumber');
      String currentBuildNumber = getIt.get<PackageInfo>().buildNumber;

      debugPrint('[remote config listener] 서버버전: $serverVersion');
      debugPrint('[remote config listener] 현재버전: $currentBuildNumber');

    });
  }

  @override
  void dispose() {
    WidgetsBinding.instance.removeObserver(this);
    _linkSubscription?.cancel();
    _remoteConfigSubscription?.cancel(); // 실시간 리스너 구독 해제
    _remoteConfigSubscription = null;
    super.dispose();
  }

Firebase Core version

4.3.0

Flutter Version

3.38.6

Relevant Log Output

Flutter dependencies

Expand Flutter dependencies snippet

Replace this line with the contents of your `flutter pub deps -- --style=compact`.

Additional context and comments

(#12539)

Same situation as the issue above

[SelaseKay]

Hi @kimdindoo, thanks for the report. By "restarting the app", do you mean hot restart or killing the app(in release mode) and opening the app from the terminated state?

[kimdindoo]

Hi @SelaseKay, hot restart!

[Lyokone]

Hey, confirmed bug — thanks for the report!

On iOS/macOS, didReinitializeFirebaseCore wasn't cleaning up native config update listeners on hot restart, so old listeners persisted and new ones stacked on top. Android already handles this correctly. Fix is on the way.