--- a/editor/libeditor/nsEditor.cpp
+++ b/editor/libeditor/nsEditor.cpp
@@ -1759,17 +1759,17 @@ public:
   {
   }
 
   NS_IMETHOD Run()
   {
     // Note that we don't need to check mDispatchInputEvent here.  We need
     // to check it only when the editor requests to dispatch the input event.
 
-    if (!mTarget->IsInDoc()) {
+    if (!mTarget->IsInComposedDoc()) {
       return NS_OK;
     }
 
     nsCOMPtr<nsIPresShell> ps = mEditor->GetPresShell();
     if (!ps) {
       return NS_OK;
     }