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via mozilla.com by Unknown author, 1 year ago
Attempt to invoke virtual method ''android.view.ViewTreeObserver android.view.View.getViewTreeObserver()'' on a null object reference
java.lang.NullPointerException: Attempt to invoke virtual method ''android.view.ViewTreeObserver android.view.View.getViewTreeObserver()'' on a null object reference	at android.widget.PopupWindow.registerForScrollChanged(PopupWindow.java)