The onItemChangeListener crashes So I am currently working on a spinner that changes entries in a list. When loading into the Fragment and loading the List into the spinner adapter and setting up the onItemChangedListener everything works fine. But when the App goes to another Fragment and then goes back the app crashes with the following exception: E/AndroidRuntime: FATAL EXCEPTION: main Process: de.heffnersoftware.hsproduction, PID: 13111 java.lang.NullPointerException: Parameter specified as non-null is null: method...