Firebase – Flutter gives error when trying to call reload method

I’m building a flutter Android application and I’m using Firebase Authentication for managing the user.

Email Verify view

See the above email verify view.

I’m trying to refresh the details of my user. Whether the user is verified or not on pressing the continue button. But I’m getting the following errors:

I’m getting the below message for await user.reload();

The method ‘reload’ can’t be unconditionally invoked because the receiver can be ‘null’.

I’m getting the below message for user = await AuthService.firebase().currentUser();

The function can’t be unconditionally invoked because it can be ‘null’.

My code for OnPressed :

onPressed: () async {
  var user = AuthService.firebase().currentUser;
  await user.reload();
  user = await AuthService.firebase().currentUser();
  if (user?.isEmailVerified ?? false) {
    // user's email is verified
    Navigator.of(context).pushNamedAndRemoveUntil(
      passwordsRoute,
      (route) => false,
    );
  } else {
    // user's email is NOT verified
    Navigator.of(context).pushNamedAndRemoveUntil(
      verifyEmailRoute,
      (route) => false,
    );
  }
},