Unhandled Exception: NoSuchMethodError: The getter 'isEmailVerified' was called on null - firebase

Question

I am getting the above mentioned error when logging in. This exception is raised even after I am ensuring that the isEmailVerified() is called only after checking whether the current user is null or not.
My authentication.dart file looks like below:
import 'dart:async';
import 'package:firebase_auth/firebase_auth.dart';
abstract class BaseAuth {
Future<String> signIn(String email, String password);
Future<String> signUp(String email, String password);
Future<FirebaseUser> getCurrentUser();
Future<void> sendEmailVerification();
Future<void> signOut();
Future<bool> isEmailVerified();
}
class Auth implements BaseAuth {
final FirebaseAuth _firebaseAuth = FirebaseAuth.instance;
Future<String> signIn(String email, String password) async {
AuthResult result = await _firebaseAuth.signInWithEmailAndPassword(
email: email, password: password);
FirebaseUser user = result.user;
return user.uid;
}
Future<String> signUp(String email, String password) async {
AuthResult result = await _firebaseAuth.createUserWithEmailAndPassword(
email: email, password: password);
FirebaseUser user = result.user;
sendEmailVerification();
return user.uid;
}
Future<FirebaseUser> getCurrentUser() async {
FirebaseUser user = await _firebaseAuth.currentUser();
return user;
}
Future<void> signOut() async {
return _firebaseAuth.signOut();
}
Future<void> sendEmailVerification() async {
FirebaseUser user = await _firebaseAuth.currentUser();
user.sendEmailVerification();
}
Future<bool> isEmailVerified() async {
FirebaseUser user = await _firebaseAuth.currentUser();
return user.isEmailVerified;
}
}
And inside the LoginPage, I am checking like this:
if(auth.signIn(email, password)!=null)
{
if(auth.getCurrentUser()!=null)
{
if(auth.isEmailVerified() != null) {
Toast.show("Login Successful!", context, duration: Toast.LENGTH_SHORT, gravity: Toast.BOTTOM);
Route route = MaterialPageRoute(builder: (context) => HomePage());
Navigator.pushReplacement(context, route);
}
}
}
I don't know how to resolve this. Any help is appreciated.

Answer 1

From your Auth class, your methods have future signatures.
You will have to await their results since it will be needed by the other conditions.
You can do:
if((await auth.signIn(email, password))!=null){
if((await auth.getCurrentUser())!=null){
if((await auth.isEmailVerified()) != null) {
Toast.show("Login Successful!", context, duration: Toast.LENGTH_SHORT, gravity: Toast.BOTTOM);
Route route = MaterialPageRoute(builder: (context) => HomePage());
Navigator.pushReplacement(context, route);
}
}
}
But the snippet above must be placed in within an async method.