Why do I get the same sign-in error in Flutter Firebase auth?

[Ahmad-alnahal]

since there is no function that checks if a user exists in the Firebase auth email and password I used the sign-in function as the Firebase docs say, and I entered an existing email with a false password and the on FirebaseAuthException catch 'INVALID_LOGIN_CREDENTIALS', then I entered not exist email and password and the on FirebaseAuthException catch returned the same error 'INVALID_LOGIN_CREDENTIALS'
is there any solution or other ideas to help me :(

this is my code :

try {
      await auth.signInWithEmailAndPassword(email: email, password: password)
          .then((value) {
                print('<log> user logged in !!');
                isLogged = true;
      });
      await auth.currentUser?.reload().then((value) {
        print('<log> currentUser reloaded !!');
        print('<log> currentUser  email => ${auth.currentUser?.email}');
      }).onError((error, stackTrace) {
        print('<log> Error in reload => $error');
      });
    } on FirebaseAuthException catch (e) {
      switch (e.code) {
        case 'wrong-password':
          print('<log> wrong-password');
          isLogged = false;
        case 'INVALID_LOGIN_CREDENTIALS':
          isLogged = false;
      }
      print('<log> error in login => ${e.code}');
      isLogged = false;
    }

what log returned :

    I/flutter (12993): <log> error in login => INVALID_LOGIN_CREDENTIALS

[marudevelop]

I have same error, too :(