task.getResult () вернуть ноль?

Question

После включения местоположения в настройках task.getResult () возвращает ноль.Если попробовать еще раз, все будет хорошо.В чем проблема ?вот код

mFusedLocationProviderClient = LocationServices.getFusedLocationProviderClient(MainActivity.this);
    try {
        if (mLocationPermissionsGranted) {
            Task<Location> location = mFusedLocationProviderClient.getLastLocation();
            location.addOnCompleteListener(new OnCompleteListener<Location>() {
                @Override
                public void onComplete(@NonNull Task<Location> task) {
                    if (task.isSuccessful()) {
                        Log.d(TAG, "onComplete: found location!");
                        currentLocation = task.getResult(); // task.getResult() returns null
                        if (currentLocation != null) {
                            moveCamera(new LatLng(currentLocation.getLatitude(), currentLocation.getLongitude()), DEFAULT_ZOOM, "My Location", cameraMovingMode);
                        }
                    } else {
                        Log.d(TAG, "onComplete: current location is null");
                        Toast.makeText(MainActivity.this, "unable to get current location", Toast.LENGTH_SHORT).show();
                    }
                }
            });
        }
    } catch (SecurityException e) {
        Log.e(TAG, "getDeviceLocation: SecurityException: " + e.getMessage());
    }