--- a/widget/src/qt/nsCommonWidget.cpp
+++ b/widget/src/qt/nsCommonWidget.cpp
@@ -802,26 +802,27 @@ nsCommonWidget::SetPreferredSize(int w, 
 }
 
 NS_IMETHODIMP
 nsCommonWidget::DispatchEvent(nsGUIEvent *aEvent, nsEventStatus &aStatus)
 {
     aStatus = nsEventStatus_eIgnore;
 
     // hold a widget reference while we dispatch this event
-    NS_ADDREF(aEvent->widget);
+    nsIWidget* widget = aEvent->widget;
+    NS_ADDREF(widget);
 
     if (mEventCallback)
         aStatus = (*mEventCallback)(aEvent);
 
     // dispatch to event listener if event was not consumed
     if ((aStatus != nsEventStatus_eIgnore) && mEventListener)
         aStatus = mEventListener->ProcessEvent(*aEvent);
 
-    NS_IF_RELEASE(aEvent->widget);
+    NS_IF_RELEASE(widget);
 
     return NS_OK;
 }
 
 NS_IMETHODIMP
 nsCommonWidget::CaptureRollupEvents(nsIRollupListener*, PRBool, PRBool)
 {
     return NS_OK;