Flutter app for iOS crashes on startup with Secondary Firebase app

[masteradit]

I have a Flutter app, in which I tried to initialise a secondary app using the code given in the docs:

await Firebase.initializeApp(
    name: 'SecondaryApp',
    options: const FirebaseOptions(
        appId: 'my_appId',
        apiKey: 'my_apiKey',
        messagingSenderId: 'my_messagingSenderId',
        projectId: 'my_projectId'
    )
);

It works on Android, but on iOS (iPhone 6S), the app keeps crashing on startup. Is there something that I am missing?

Here's the code of the dart file where I am initialising the Firebase apps:

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

class FirebaseInitialisationScreen extends StatelessWidget {
  Future _initialiseFirebase() async {
    await Firebase.initializeApp();

    List<String> appNames = Firebase.apps.map((app) {
      return app.name;
    }).toList();

    // if statement to make sure that the secondary app does not get initialised again
    if (!appNames.contains('SecondaryApp')) {
      await Firebase.initializeApp(
        name: 'SecondaryApp',
        options: FirebaseOptions(
          androidClientId: '...',
          apiKey: '...',
          appId: '...',
          messagingSenderId: '...',
          projectId: '...',
          iosBundleId: '...',
          iosClientId: '...',
        ),
      );
    }
  }

  @override
  Widget build(BuildContext context) {
    return FutureBuilder(
      // Initialize FlutterFire:
      future: _initialiseFirebase(),
      builder: (context, snapshot) {
        // Check for errors
        if (snapshot.hasError) {
          return Scaffold(
            body: Center(
              child: Text('Something went wrong! :('),
            ),
          );
        }

        // Once complete, show your application
        if (snapshot.connectionState == ConnectionState.done) {
          print('Initialisation done!');
          return MainScreen();
        }

        // Otherwise, show something whilst waiting for initialization to complete
        return Scaffold(
          body: Center(
            child: CircularProgressIndicator(),
          ),
        );
      },
    );
  }
}

[masteradit]

I found the solution. I was using the wrong appId.

I am not sure how to close a discussion on Github. Closes #4879

[saw1993]

The reason for crashing on iOS is the AppID , it's different for ios and android. in flutter we define appid for both .
AppID for android is something like xxxxxxxxxandroidxxxxxxx and for ios is xxxxxxxxxiosxxxxxxxx when we input android appid it works fine for android but crashes on ios .