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Attempt to invoke virtual method 'android.view.View android.view.View.findViewById(int)' on a null object reference
java.lang.NullPointerException: Attempt to invoke virtual method 'android.view.View android.view.View.findViewById(int)' on a null object reference	at br.com.stickyindex.layout.IndexLayoutManager.update(IndexLayoutManager.java:57)	at br.com.stickyindex.listener.IndexScrollListener.notifySubscribers(IndexScrollListener.java:43)	at br.com.stickyindex.listener.IndexScrollListener.onScrolled(IndexScrollListener.java:26)	at android.support.v7.widget.RecyclerView.dispatchOnScrolled(RecyclerView.java:3630)	at android.support.v7.widget.RecyclerView.dispatchLayout(RecyclerView.java:2784)	at android.support.v7.widget.RecyclerView.onLayout(RecyclerView.java:2971)	at android.view.View.layout(View.java:15671)	at android.view.ViewGroup.layout(ViewGroup.java:5038)	at android.widget.RelativeLayout.onLayout(RelativeLayout.java:1076)	at android.view.View.layout(View.java:15671)	at android.view.ViewGroup.layout(ViewGroup.java:5038)	at android.support.v4.widget.SwipeRefreshLayout.onLayout(SwipeRefreshLayout.java:562)	at android.view.View.layout(View.java:15671)	at android.view.ViewGroup.layout(ViewGroup.java:5038)	at android.support.v4.view.ViewPager.onLayout(ViewPager.java:1626)	at android.view.View.layout(View.java:15671)	at android.view.ViewGroup.layout(ViewGroup.java:5038)	at android.support.design.widget.CoordinatorLayout.layoutChild(CoordinatorLayout.java:1000)	at android.support.design.widget.CoordinatorLayout.onLayoutChild(CoordinatorLayout.java:710)	at android.support.design.widget.ViewOffsetBehavior.onLayoutChild(ViewOffsetBehavior.java:42)	at android.support.design.widget.AppBarLayout$ScrollingViewBehavior.onLayoutChild(AppBarLayout.java:982)	at android.support.design.widget.CoordinatorLayout.onLayout(CoordinatorLayout.java:723)	at android.view.View.layout(View.java:15671)	at android.view.ViewGroup.layout(ViewGroup.java:5038)	at android.support.v4.widget.DrawerLayout.onLayout(DrawerLayout.java:907)	at android.view.View.layout(View.java:15671)	at android.view.ViewGroup.layout(ViewGroup.java:5038)	at android.widget.FrameLayout.layoutChildren(FrameLayout.java:579)	at android.widget.FrameLayout.onLayout(FrameLayout.java:514)	at android.view.View.layout(View.java:15671)	at android.view.ViewGroup.layout(ViewGroup.java:5038)	at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1703)	at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1557)	at android.widget.LinearLayout.onLayout(LinearLayout.java:1466)	at android.view.View.layout(View.java:15671)	at android.view.ViewGroup.layout(ViewGroup.java:5038)	at android.widget.FrameLayout.layoutChildren(FrameLayout.java:579)	at android.widget.FrameLayout.onLayout(FrameLayout.java:514)	at android.view.View.layout(View.java:15671)	at android.view.ViewGroup.layout(ViewGroup.java:5038)	at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1703)	at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1557)	at android.widget.LinearLayout.onLayout(LinearLayout.java:1466)	at android.view.View.layout(View.java:15671)	at android.view.ViewGroup.layout(ViewGroup.java:5038)	at android.widget.FrameLayout.layoutChildren(FrameLayout.java:579)	at android.widget.FrameLayout.onLayout(FrameLayout.java:514)	at android.view.View.layout(View.java:15671)	at android.view.ViewGroup.layout(ViewGroup.java:5038)	at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:2086)	at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1843)	at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1061)	at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5885)	at android.view.Choreographer$CallbackRecord.run(Choreographer.java:767)	at android.view.Choreographer.doCallbacks(Choreographer.java:580)	at android.view.Choreographer.doFrame(Choreographer.java:550)	at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:753)	at android.os.Handler.handleCallback(Handler.java:739)