--- a/layout/xul/nsMenuBarListener.cpp
+++ b/layout/xul/nsMenuBarListener.cpp
@@ -206,17 +206,18 @@ nsMenuBarListener::KeyPress(nsIDOMEvent*
   InitAccessKey();
 
   if (mAccessKey)
   {
     // If accesskey handling was forwarded to a child process, wait for
     // the mozaccesskeynotfound event before handling accesskeys.
     WidgetKeyboardEvent* nativeKeyEvent =
       aKeyEvent->WidgetEventPtr()->AsKeyboardEvent();
-    if (nativeKeyEvent && nativeKeyEvent->mAccessKeyForwardedToChild) {
+    if (!nativeKeyEvent || nativeKeyEvent &&
+      nativeKeyEvent->mAccessKeyForwardedToChild) {
       return NS_OK;
     }
 
     nsCOMPtr<nsIDOMKeyEvent> keyEvent = do_QueryInterface(aKeyEvent);
     uint32_t keyCode, charCode;
     keyEvent->GetKeyCode(&keyCode);
     keyEvent->GetCharCode(&charCode);
 
@@ -246,17 +247,17 @@ nsMenuBarListener::KeyPress(nsIDOMEvent*
 
         // The opened menu will listen next keyup event.
         // Therefore, we should clear the keydown flags here.
         mAccessKeyDown = mAccessKeyDownCanceled = false;
 
         aKeyEvent->StopPropagation();
         aKeyEvent->PreventDefault();
       }
-    }    
+    }
 #ifndef XP_MACOSX
     // Also need to handle F10 specially on Non-Mac platform.
     else if (nativeKeyEvent->mMessage == eKeyPress && keyCode == NS_VK_F10) {
       if ((GetModifiersForAccessKey(keyEvent) & ~MODIFIER_CONTROL) == 0) {
         // The F10 key just went down by itself or with ctrl pressed.
         // In Windows, both of these activate the menu bar.
         mMenuBarFrame->SetActiveByKeyboard();
         ToggleMenuActiveState();