Save Location with sharedpreferences - what default value do I have to use?

hi I'm trying to save a location with sharedpreferences but when I want to load it I can not.

The problem is in the load in the default value that I put that is null but I do not know that another value put probe with several things but I do not take it either

If you have any solution, either a default value or another way of saving it with shared preferences, I would appreciate it

this is my shared preferences code.

    public void guardarpreferencias() {
    SharedPreferences preferences = getSharedPreferences("localizaciones", Context.MODE_PRIVATE);
    SharedPreferences.Editor editor = preferences.edit();
    Gson gson = new Gson();
    String json = gson.toJson(loccasa);
    editor.putString("localizacionC", json);
    json = gson.toJson(loctrabajo);
    editor.putString("localizacionT", json);
    json = gson.toJson(locfacultad);
    editor.putString("localizacionF", json);
    editor.apply();
}


    public void cargarpreferencias(){
        SharedPreferences preferences = getSharedPreferences("localizaciones", Context.MODE_PRIVATE);
        Gson gson = new Gson();
        String json = preferences.getString("localizacionC", null);
        Type type = new TypeToken<Location>() {
        }.getType();
        loccasa = gson.fromJson(json, type);
        json = preferences.getString("LocalizacionT", null);
        type = new TypeToken<Location>() {
        }.getType();
        loctrabajo = gson.fromJson(json, type);
        json = preferences.getString("LocalizacionF", null);
        type = new TypeToken<Location>() {
        }.getType();
        locfacultad = gson.fromJson(json, type);

    }

this would be the error that throws me

  

Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'float android.location.Location.distanceTo (android.location.Location)' on a null object reference

When I try to use the variable that loads it can not because it is null, for the first time I do not know what value to put default