diff --git a/dom/base/nsObjectLoadingContent.cpp b/dom/base/nsObjectLoadingContent.cpp
index fa8eb49f65ab..ef8aad101a92 100644
--- a/dom/base/nsObjectLoadingContent.cpp
+++ b/dom/base/nsObjectLoadingContent.cpp
@@ -2719,8 +2719,8 @@ nsObjectLoadingContent::NotifyStateChanged(ObjectType aOldType,
   EventStates newState = ObjectState();
 
   if (newState != aOldState) {
+    NS_ASSERTION(thisContent->IsInComposedDoc(), "Something is confused");
     // This will trigger frame construction
-    NS_ASSERTION(InActiveDocument(thisContent), "Something is confused");
     EventStates changedBits = aOldState ^ newState;
 
     {
@@ -2728,6 +2728,7 @@ nsObjectLoadingContent::NotifyStateChanged(ObjectType aOldType,
       doc->ContentStateChanged(thisContent, changedBits);
     }
     if (aSync) {
+      NS_ASSERTION(InActiveDocument(thisContent), "Something is confused");
       // Make sure that frames are actually constructed immediately.
       doc->FlushPendingNotifications(Flush_Frames);
     }