OnLoadMoreListener

Im getting
UltimateRecyclerView$OnLoadMoreListener.loadMore(int, int)' on a null object reference
after coming back to list !
Here's the full log:
`java.lang.NullPointerException: Attempt to invoke interface method 'void com.marshalchen.ultimaterecyclerview.UltimateRecyclerView$OnLoadMoreListener.loadMore(int, int)' on a null object reference
at com.marshalchen.ultimaterecyclerview.UltimateRecyclerView.scroll_load_more_detection(UltimateRecyclerView.java:476)
at com.marshalchen.ultimaterecyclerview.UltimateRecyclerView.access$300(UltimateRecyclerView.java:61)
at com.marshalchen.ultimaterecyclerview.UltimateRecyclerView$2.onScrolled(UltimateRecyclerView.java:498)
at android.support.v7.widget.RecyclerView.dispatchOnScrolled(RecyclerView.java:4722)
at android.support.v7.widget.RecyclerView$ViewFlinger.run(RecyclerView.java:4891)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:871)
at android.view.Choreographer.doCallbacks(Choreographer.java:683)
at android.view.Choreographer.doFrame(Choreographer.java:616)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:857)
at android.os.Handler.handleCallback(Handler.java:751)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6077)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:866)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:756)`

Start in UltimateRecyclerView.java at scroll_load_more_detection (line 476) and the RecyclerView onScrolled handler (line 498) shown in the stack trace. Reproduce returning to the list and trace why OnLoadMoreListener is null; done means returning to the list no longer causes this crash while load-more behavior remains intact.

Written by the indexing model from the issue text.