NullPointerException on requestDisallowInterceptTouchEvent

[cuberob]

I'm using the ZoomageView inside a ViewPager and sometimes seeing the following crash. Any suggestions?

Fatal Exception: java.lang.NullPointerException: Attempt to invoke interface method 'void android.view.ViewParent.requestDisallowInterceptTouchEvent(boolean)' on a null object reference
       at com.jsibbold.zoomage.ZoomageView.onTouchEvent(ZoomageView.java:517)
       at android.view.View.dispatchTouchEvent(View.java:15199)
       at android.view.ViewGroup.cancelTouchTarget(ViewGroup.java:3810)
       at android.view.ViewGroup.removeDetachedView(ViewGroup.java:6670)
       at androidx.recyclerview.widget.RecyclerView.removeDetachedView(RecyclerView.java:4524)
       at androidx.recyclerview.widget.RecyclerView$LayoutManager.removeAndRecycleScrapInt(RecyclerView.java:9541)
       at androidx.recyclerview.widget.RecyclerView.dispatchLayoutStep3(RecyclerView.java:4381)
       at androidx.recyclerview.widget.RecyclerView.dispatchLayout(RecyclerView.java:4031)
       at androidx.recyclerview.widget.RecyclerView.onLayout(RecyclerView.java:4578)
       at android.view.View.layout(View.java:24475)
       at android.view.ViewGroup.layout(ViewGroup.java:7383)
       at androidx.viewpager2.widget.ViewPager2.onLayout(ViewPager2.java:527)
       at android.view.View.layout(View.java:24475)
       at android.view.ViewGroup.layout(ViewGroup.java:7383)
       at androidx.constraintlayout.widget.ConstraintLayout.onLayout(ConstraintLayout.java:1873)
       at android.view.View.layout(View.java:24475)
       at android.view.ViewGroup.layout(ViewGroup.java:7383)
       at android.widget.FrameLayout.layoutChildren(FrameLayout.java:332)
       at android.widget.FrameLayout.onLayout(FrameLayout.java:270)
       at android.view.View.layout(View.java:24475)
       at android.view.ViewGroup.layout(ViewGroup.java:7383)
       at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1829)
       at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1673)
       at android.widget.LinearLayout.onLayout(LinearLayout.java:1582)
       at android.view.View.layout(View.java:24475)
       at android.view.ViewGroup.layout(ViewGroup.java:7383)
       at android.widget.FrameLayout.layoutChildren(FrameLayout.java:332)
       at android.widget.FrameLayout.onLayout(FrameLayout.java:270)
       at com.android.internal.policy.DecorView.onLayout(DecorView.java:1225)
       at android.view.View.layout(View.java:24475)
       at android.view.ViewGroup.layout(ViewGroup.java:7383)
       at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:4260)
       at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:3695)
       at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:2618)
       at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:9971)
       at android.view.Choreographer$CallbackRecord.run(Choreographer.java:1010)
       at android.view.Choreographer.doCallbacks(Choreographer.java:809)
       at android.view.Choreographer.doFrame(Choreographer.java:744)
       at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:995)
       at android.os.Handler.handleCallback(Handler.java:938)
       at android.os.Handler.dispatchMessage(Handler.java:99)
       at android.os.Looper.loop(Looper.java:246)
       at android.app.ActivityThread.main(ActivityThread.java:8625)
       at java.lang.reflect.Method.invoke(Method.java)
       at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:602)
       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1130)