Flutter firebase error Exception has occurred. LateError (LateInitializationError: Local 'fireb-CodePudding

I am new to flutter and trying to integrate flutter and firebase. I created a flutter project and added the android and ios app and then downloaded the files to the flutter app. But when I run the project I am getting the following error

Exception has occurred.LateError (LateInitializationError: Local 'firebaseUser' has not been initialized.)

What may be the reason? These are the lines of code

  Future<bool> signInAnonymously() async {
if (Configurations.shared.isThisVersionTestedInAppStore ||
    Utils.isInDebugMode!) {
  late UserCredential firebaseUser;
  try {
    firebaseUser = await FirebaseAuth.instance.signInAnonymously();
  } catch (e) {
    AppLogger.error(e);
  }

  return didLogInSuccessfully(withUser: firebaseUser.user);
} else {
  return false;
}}

main.dart file contents

Future<void> main() async {
  WidgetsFlutterBinding.ensureInitialized();
  await Firebase.initializeApp();
  await Configurations.shared.init();
  await Repository.shared.init();

  runApp(Configurations.shared.getMainAppWidget());

  runTestScripts();
}

void runTestScripts() {

  Utils.test();
  Synchronizer.test();
  Localized.test();
}

CodePudding user response：

Did you add these lines at main.dart to make sure the firebase starts before the app launches.

Future<void> main() async {
      WidgetsFlutterBinding.ensureInitialized();
      await Firebase.initializeApp();
      runApp(const ChatApp());
    }

CodePudding user response：

You're getting the error because you are attempting to use the firebaseUser variable without initializing it.

This is because firebaseUser did not get a value in the line below:

    firebaseUser = await FirebaseAuth.instance.signInAnonymously();

Since the firebaseUser variable can be null, you can change it from a late variable to a nullable variable like this:

Change this:

  late UserCredential firebaseUser;

to this:

  UserCredential? firebaseUser;

And update your return statement from this:

  return didLogInSuccessfully(withUser: firebaseUser.user);

to this:

  return didLogInSuccessfully(withUser: firebaseUser?.user);

This only calls the .user property on firebaseUser if the variable is not null.

Your updated code should be this:

  Future<bool> signInAnonymously() async {
    if (Configurations.shared.isThisVersionTestedInAppStore ||
      Utils.isInDebugMode!) {
      UserCredential? firebaseUser;
      try {
        firebaseUser = await FirebaseAuth.instance.signInAnonymously();
      } catch (e) {
        AppLogger.error(e);
      }

      return didLogInSuccessfully(withUser: firebaseUser?.user);
    } else {
      return false;
    }
  }