Attempt to write to field 'android.view.ViewParent android.view.View.mParent' on a null object reference

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I have an activity (say A )which is launched in singleTask mode. I created a view in this activity which looks like popup and added it to the parent view of the activity A. Now i launched Activity A from somewhere else , since its singleTask so i receive onNewIntent() call, where i reinitialise the new view. But how do i destroy this popup before i reinitialise A.

Here is my code :
This is how i created popup.

 final ViewGroup rootView = (ViewGroup) getWindow().getDecorView().getRootView();
 RelativeLayout popup = (RelativeLayout) LayoutInflater.from(this).inflate(R.layout.popup_r,null);
popupView = popup;
rootView.addView(popup);

Here is my onNewIntent method

@Override
 protected void onNewIntent(Intent intent) 
 super.onNewIntent(intent);

 if (popupView != null)
 
 ((ViewGroup)popupView.getParent()).removeView(popupView);
 popupView = null;
 

 setIntent(intent);
 setContentView(R.layout.activity_view);
 reinitView();
 

But This give me crash saying :

java.lang.NullPointerException: Attempt to write to field 'android.view.ViewParent android.view.View.mParent' on a null object reference

at line ((ViewGroup)popupView.getParent()).removeView(popupView);

How do remove popupview before reinitialising activity with new intent.

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