Crash when using diffutil

[murzagalin]

Process: de.tvsmiles.app.debug, PID: 28921 java.lang.IndexOutOfBoundsException: Invalid item position 15(15). Item count:12 android.support.v7.widget.RecyclerView{9b933bd VFED..... .F....I. 0,0-1080,1704 #7f090067 app:id/campaigns_list}, adapter:com.kwizzad.akwizz.homescreen.campaignslist.CampaignsAdapter@2cccdb2, layout:com.ch4vi.flowlayoutmanager.FlowLayoutManager@18c0103, context:com.kwizzad.akwizz.homescreen.HomeActivity@a313088 at android.support.v7.widget.RecyclerView$Recycler.tryGetViewHolderForPositionByDeadline(RecyclerView.java:5779) at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:5752) at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:5748) at com.ch4vi.flowlayoutmanager.FlowLayoutManager.layoutChildren(FlowLayoutManager.kt:178) at com.ch4vi.flowlayoutmanager.FlowLayoutManager.onLayoutChildren(FlowLayoutManager.kt:119) at android.support.v7.widget.RecyclerView.dispatchLayoutStep1(RecyclerView.java:3763) at android.support.v7.widget.RecyclerView.dispatchLayout(RecyclerView.java:3527) at android.support.v7.widget.RecyclerView.onLayout(RecyclerView.java:4082) at android.view.View.layout(View.java:16636) at android.view.ViewGroup.layout(ViewGroup.java:5437) at android.support.v4.widget.SwipeRefreshLayout.onLayout(SwipeRefreshLayout.java:606) at android.view.View.layout(View.java:16636) at android.view.ViewGroup.layout(ViewGroup.java:5437) at android.widget.FrameLayout.layoutChildren(FrameLayout.java:336) at android.widget.FrameLayout.onLayout(FrameLayout.java:273) at android.view.View.layout(View.java:16636) at android.view.ViewGroup.layout(ViewGroup.java:5437) at android.support.design.widget.HeaderScrollingViewBehavior.layoutChild(HeaderScrollingViewBehavior.java:132) at android.support.design.widget.ViewOffsetBehavior.onLayoutChild(ViewOffsetBehavior.java:42) at android.support.design.widget.AppBarLayout$ScrollingViewBehavior.onLayoutChild(AppBarLayout.java:1361) at android.support.design.widget.CoordinatorLayout.onLayout(CoordinatorLayout.java:894) at android.view.View.layout(View.java:16636) at android.view.ViewGroup.layout(ViewGroup.java:5437) at android.widget.FrameLayout.layoutChildren(FrameLayout.java:336) at android.widget.FrameLayout.onLayout(FrameLayout.java:273) at android.view.View.layout(View.java:16636) at android.view.ViewGroup.layout(ViewGroup.java:5437) at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1743) at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1586) at android.widget.LinearLayout.onLayout(LinearLayout.java:1495) at android.view.View.layout(View.java:16636) at android.view.ViewGroup.layout(ViewGroup.java:5437) at android.widget.FrameLayout.layoutChildren(FrameLayout.java:336) at android.widget.FrameLayout.onLayout(FrameLayout.java:273) at android.view.View.layout(View.java:16636) at android.view.ViewGroup.layout(ViewGroup.java:5437) at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1743) at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1586) at android.widget.LinearLayout.onLayout(LinearLayout.java:1495) at android.view.View.layout(View.java:16636) at android.view.ViewGroup.layout(ViewGroup.java:5437) at android.widget.FrameLayout.layoutChildren(FrameLayout.java:336) at android.widget.FrameLayout.onLayout(FrameLayout.java:273) at com.android.internal.policy.PhoneWindow$DecorView.onLayout(PhoneWindow.java:2678) at android.view.View.layout(View.java:16636) at android.view.ViewGroup.layout(ViewGroup.java:5437) at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:2171) at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1931) at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1107) at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6013) at android.view.Choreographer$CallbackRecord.run(Choreographer.java:858) at android.view.Choreographer.doCallbacks(Choreographer.java:670) at android.view.Choreograp