--- a/dom/events/DragEvent.cpp
+++ b/dom/events/DragEvent.cpp
@@ -54,17 +54,17 @@ DragEvent::InitDragEvent(const nsAString
                          uint16_t aButton,
                          EventTarget* aRelatedTarget,
                          DataTransfer* aDataTransfer)
 {
   MouseEvent::InitMouseEvent(aType, aCanBubble, aCancelable,
                              aView, aDetail, aScreenX, aScreenY,
                              aClientX, aClientY, aCtrlKey, aAltKey,
                              aShiftKey, aMetaKey, aButton, aRelatedTarget);
-  if (mEventIsInternal && mEvent) {
+  if (mEventIsInternal) {
     mEvent->AsDragEvent()->mDataTransfer = aDataTransfer;
   }
 }
 
 NS_IMETHODIMP
 DragEvent::GetDataTransfer(nsIDOMDataTransfer** aDataTransfer)
 {
   NS_IF_ADDREF(*aDataTransfer = GetDataTransfer());