I’m using flutter and google sign in through firebase ( mobile app) with laravel backend, the app is connected through api website url
the issue is when i login with google auth it works well and when i logout i cant login again i got this error msg in android studio terminal firebase_auth/provider-already-linked]?
if i delete the user from my back end db i can login again
here is my code if anyone has an idea ?

Future<User> signInWithGoogle(BuildContext context) async {
final GoogleSignIn googleSignIn = GoogleSignIn();
GoogleSignInAccount? googleSignInAccount = await googleSignIn.signIn();

if (googleSignInAccount != null) {
  final GoogleSignInAuthentication googleSignInAuthentication = await googleSignInAccount.authentication;

  final AuthCredential credential = GoogleAuthProvider.credential(
    accessToken: googleSignInAuthentication.accessToken,
    idToken: googleSignInAuthentication.idToken,
  );

  final UserCredential authResult = await FirebaseAuth.instance.signInWithCredential(credential);
  final User user = authResult.user!;

  assert(!user.isAnonymous);

  final User currentUser = FirebaseAuth.instance.currentUser!;
  assert(user.uid == currentUser.uid);

  try {
    AuthCredential emailAuthCredential = EmailAuthProvider.credential(email: user.email!, password: DEFAULT_FIREBASE_PASSWORD);
    user.linkWithCredential(emailAuthCredential);
  } catch (e) {
    log(e);
  }

  await googleSignIn.signOut();

  return user;
} else {
  appStore.setLoading(false);
  throw USER_NOT_CREATED;
}

}