Cannot sign in with google play games service (assertion failed)




```dart

await new GoogleSignIn.games().signIn();

```

fails with

```
E/flutter (21205): Exception: Failed to sign in with google: 'package:google_sign_in/google_sign_in.dart': Failed assertion: line 40 pos 12: 'displayName != null': is not true.
```

GPGS login dialog works properly.