Bug 763014 - crash in PresShell::HandleEventInternal, r=mats

layout/base/nsPresShell.cpp

@@ -6408,8 +6408,10 @@ PresShell::HandleEventInternal(nsEvent* aEvent, nsEventStatus* aStatus)
         }
         else {
           nsCOMPtr<nsIContent> targetContent;
-          rv = mCurrentEventFrame->GetContentForEvent(aEvent,
-                                                      getter_AddRefs(targetContent));
+          if (mCurrentEventFrame) {
+            rv = mCurrentEventFrame->GetContentForEvent(aEvent,
+                                                        getter_AddRefs(targetContent));
+          }
           if (NS_SUCCEEDED(rv) && targetContent) {
             nsEventDispatcher::Dispatch(targetContent, mPresContext, aEvent,
                                         nsnull, aStatus, &eventCB);