java.lang.RuntimeException: Unable to destroy activity {myapp.PDFViewer.PDFView_activity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.view.View.dispatchDetachedFromWindow()' on a null object reference

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java.lang.RuntimeException: Unable to destroy activity {myapp.PDFViewer.PDFView_activity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.view.View.dispatchDetachedFromWindow()' on a null object reference
at android.app.ActivityThread.performDestroyActivity(ActivityThread.java:3831)

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