This widget has been unmounted, so the State no longer has a context (and should be considered defunct). when Sign out from flutter app

Question

I'm using Firebase with Flutter to create a login method. However, when I log out of my account in the Flutter app, I get the following error:

This widget has been unmounted, so the State no longer has a context (and should be considered defunct).

Then when I log in after this error, I get this error:

setState() or markNeedsBuild() called during build.

Here is my logout code:

Future<void> signOut() async {
    if (googleSignIn.currentUser != null){
      await googleSignIn.disconnect();
      await FirebaseAuth.instance.signOut();}
    else{
      await FirebaseAuth.instance.signOut();
  }
  
    WidgetsBinding.instance.addPostFrameCallback((_) {
      Navigator.pushAndRemoveUntil(
        context,
        MaterialPageRoute(
          builder: (BuildContext context) => const AuthPage(),
        ),
            (route) => false,
      );
    });

  }

And here is the sign in code:

Future googleLogin() async{
     timer1 = Timer(const Duration(milliseconds: 1500), (){
       Navigator.of(context, rootNavigator: true).pop();
     });
     showDialog(context: context,
       barrierDismissible: false,
       builder: (context) =>   Center(
         child: SizedBox(
           width: 150, height: 150,
           child: LiquidCircularProgressIndicator(


             backgroundColor: const Color(0xFF5B84B1),
             valueColor: const AlwaysStoppedAnimation(Colors.white),



           ),
         ),
       ),
     ).then((value) {
       timer1!.cancel();
     });
     try {
       final googleUser =
       await GoogleSignIn(scopes: ['profile', 'email']).signIn();
       if (googleUser == null) return;
       _user = googleUser;

       final googleAuth = await googleUser.authentication;

       final credential = GoogleAuthProvider.credential(
         accessToken: googleAuth.accessToken,
         idToken: googleAuth.idToken,

       );

       UserCredential userCredential = await _auth.signInWithCredential(
           credential);

       if (userCredential.additionalUserInfo!.isNewUser == true) {
         if (!mounted) return;

         Navigator.pushAndRemoveUntil(
           context,
           MaterialPageRoute(
             builder: (BuildContext context) => const ProfilePage(),
           ),
               (route) => false,
         );
       }
       else {
         if (!mounted) return;

         Navigator.pushAndRemoveUntil(
           context,
           MaterialPageRoute(
             builder: (BuildContext context) => const HomeScreen(),
           ),
               (route) => false,
         );
       }
     } on PlatformException catch (e) {
       Utils.showSnackBar(e.toString());
     }

 }

Answer 1

You can check if it is mounted or not, then proceed:

if (mounted) {
  // All the action is here
}