Google Maps Fragment returning null inside a fragment

Question

So I have an empty fragment that contains a map fragment. Whenever I try to activate the fragment containing the map, my app crashes and returns a null pointer error on this

Answer 1

I have solved the issue. this line when I have a viewpager:

mMap = ((SupportMapFragment) MainActivity.fragmentManager
                .findFragmentById(R.id.mapView)).getMap();

you have to change to this:

  mMap = ((SupportMapFragment) getChildFragmentManager()
            .findFragmentById(R.id.mapView)).getMap();