Crash happens with NullPointerException

[sharukhmohammed]

java.lang.NullPointerException: Attempt to invoke virtual method 'android.view.ViewGroup$LayoutParams android.view.View.getLayoutParams()' on a null object reference
        at com.dgreenhalgh.android.simpleitemdecoration.grid.GridDividerItemDecoration.drawHorizontalDividers(GridDividerItemDecoration.java:84)
        at com.dgreenhalgh.android.simpleitemdecoration.grid.GridDividerItemDecoration.onDraw(GridDividerItemDecoration.java:43)
        at android.support.v7.widget.RecyclerView.onDraw(RecyclerView.java:4172)
        at android.view.View.draw(View.java:19192)
        at android.support.v7.widget.RecyclerView.draw(RecyclerView.java:4107)
        at android.view.View.updateDisplayListIfDirty(View.java:18142)
        at android.view.View.draw(View.java:18920)
        at android.view.ViewGroup.drawChild(ViewGroup.java:4236)
        at android.view.ViewGroup.dispatchDraw(ViewGroup.java:4022)
        at android.view.View.updateDisplayListIfDirty(View.java:18133)
        at android.view.View.draw(View.java:18920)
        at android.view.ViewGroup.drawChild(ViewGroup.java:4236)
        at android.view.ViewGroup.dispatchDraw(ViewGroup.java:4022)
        at android.view.View.updateDisplayListIfDirty(View.java:18133)
        at android.view.View.draw(View.java:18920)
        at android.view.ViewGroup.drawChild(ViewGroup.java:4236)
        at android.view.ViewGroup.dispatchDraw(ViewGroup.java:4022)
        at android.view.View.draw(View.java:19195)
        at android.support.v4.widget.NestedScrollView.draw(NestedScrollView.java:1819)
        at android.view.View.updateDisplayListIfDirty(View.java:18142)
        at android.view.View.draw(View.java:18920)
        at android.view.ViewGroup.drawChild(ViewGroup.java:4236)
        at android.view.ViewGroup.dispatchDraw(ViewGroup.java:4022)
        at android.view.View.draw(View.java:19195)
        at android.view.View.updateDisplayListIfDirty(View.java:18142)
        at android.view.View.draw(View.java:18920)
        at android.view.ViewGroup.drawChild(ViewGroup.java:4236)
        at android.view.ViewGroup.dispatchDraw(ViewGroup.java:4022)
        at android.view.View.updateDisplayListIfDirty(View.java:18133)
        at android.view.View.draw(View.java:18920)
        at android.view.ViewGroup.drawChild(ViewGroup.java:4236)
        at android.view.ViewGroup.dispatchDraw(ViewGroup.java:4022)
        at android.view.View.updateDisplayListIfDirty(View.java:18133)
        at android.view.View.draw(View.java:18920)
        at android.view.ViewGroup.drawChild(ViewGroup.java:4236)
        at android.view.ViewGroup.dispatchDraw(ViewGroup.java:4022)
        at android.view.View.updateDisplayListIfDirty(View.java:18133)
        at android.view.View.draw(View.java:18920)
        at android.view.ViewGroup.drawChild(ViewGroup.java:4236)
        at android.view.ViewGroup.dispatchDraw(ViewGroup.java:4022)
        at android.view.View.updateDisplayListIfDirty(View.java:18133)
        at android.view.View.draw(View.java:18920)
        at android.view.ViewGroup.drawChild(ViewGroup.java:4236)
        at android.view.ViewGroup.dispatchDraw(ViewGroup.java:4022)
        at android.view.View.updateDisplayListIfDirty(View.java:18133)
        at android.view.View.draw(View.java:18920)
        at android.view.ViewGroup.drawChild(ViewGroup.java:4236)
        at android.view.ViewGroup.dispatchDraw(ViewGroup.java:4022)
        at android.view.View.draw(View.java:19195)
        at com.android.internal.policy.DecorView.draw(DecorView.java:788)
        at android.view.View.updateDisplayListIfDirty(View.java:18142)
        at android.view.ThreadedRenderer.updateViewTreeDisplayList(ThreadedRenderer.java:669)
        at android.view.ThreadedRenderer.updateRootDisplayList(ThreadedRenderer.java:675)
        at android.view.ThreadedRenderer.draw(ThreadedRenderer.java:783)
        at android.view.ViewRootImpl.draw(ViewRootImpl.java:2992)
        at android.view.ViewRootImpl.performDraw(ViewRootImpl.java:2806)
        at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2359)
        at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1392)
        at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6752)
        at android.view.Choreographer$CallbackRecord.run(Choreographer.java:911)
        at android.view.Choreographer.doCallbacks(Choreographer.java:723)
09-24 18:18:27.460 7751-7751/in.wheelstreet E/AndroidRuntime:     at android.view.Choreographer.doFrame(Choreographer.java:658)
        at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:897)
        at android.os.Handler.handleCallback(Handler.java:790)
        at android.os.Handler.dispatchMessage(Handler.java:99)
        at android.os.Looper.loop(Looper.java:164)
        at android.app.ActivityThread.main(ActivityThread.java:6494)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)

And this is what my my code for adding decorations

 Drawable divider = ContextCompat.getDrawable(this, R.drawable.divider_grid);

            //Available Bikes
            bikes_available_recycler.setAdapter(new SearchBikesAdapter(searchResult.startDate, searchResult.currency.symbol, searchResult.bikes.available, true));

            //Will only add decorations if recycler has params
            if (bikes_unavailable_recycler.getChildCount()>0) {
                bikes_available_recycler.addItemDecoration(new GridDividerItemDecoration(divider, divider, 2));
            }

            //Unavailable Bikes
            LinearLayout unavailable_layout = findViewById(R.id.activity_search_bikes_unavailable_layout);
            if (searchResult.bikes.unavailable != null) {
                bikes_unavailable_recycler.setAdapter(new SearchBikesAdapter(searchResult.startDate, searchResult.currency.symbol, searchResult.bikes.unavailable, false));
                unavailable_layout.setVisibility(View.VISIBLE);
                //Will only add decorations if recycler has params
                if (bikes_unavailable_recycler.getChildCount()>0) {
                    bikes_unavailable_recycler.addItemDecoration(new GridDividerItemDecoration(divider, divider, 2));
                }
            } else {
                unavailable_layout.setVisibility(View.INVISIBLE);
            }