I am working on a Android Studio weather app, and I keep getting the following error: NullPointerException

Question

The Error says it is Caused by: "java.lang.NullPointerException: Attempt to invoke virtual method 'boolean java.lang.String.equals(java.lang.Object)' on a null object reference"

Here is the code that it references.:

//LINE 84-->86//
Location location = locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
        cityName = getCityName(location.getLongitude(), location.getLatitude());
        getWeatherInfo(cityName);

//LINE 114 --> 134//
    private String getCityName(double longitude, double latitude) {
        String cityName = "Not found";
        Geocoder gcd = new Geocoder(getBaseContext(), Locale.getDefault());
        try {
            List<Address> addresses = gcd.getFromLocation(latitude, longitude, 10);
            for (Address adr : addresses) {
                if (adr != null) {
                    String city = adr.getLocality();
                    if (city != null & city.equals("")) {
                        cityName = city;
                    } else {
                        Log.d("TAG", "CITY NOT FOUND");
                        Toast.makeText(this, "User City Not Found...", Toast.LENGTH_SHORT).show();
                    }
                }
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
        return cityName;
    }