Null Pointer Exception in second fragment

[mohamadhadibi]

if we use this in fragment it is cool but, if only when it is the first fragment shown in activity, if you hide a fragment and show second fragment which use this library in it, it caught an error:
java.lang.NullPointerException: Attempt to invoke virtual method 'int android.support.v7.widget.RecyclerView$LayoutManager.getChildCount()' on a null object reference

[tosslife]

sorry this library already old，please see other。tks