diff --git a/mozilla/layout/generic/nsFrameFrame.cpp b/mozilla/layout/generic/nsFrameFrame.cpp
index 2c7fa1b714c..56dfa7fab3b 100644
--- a/mozilla/layout/generic/nsFrameFrame.cpp
+++ b/mozilla/layout/generic/nsFrameFrame.cpp
@@ -552,8 +552,9 @@ nsHTMLFrameOuterFrame::AttributeChanged(nsIPresContext* aPresContext,
   nsCOMPtr<nsIAtom> type;
   aChild->GetTag(*getter_AddRefs(type));
 
-  if ((type != nsHTMLAtoms::object && aAttribute == nsHTMLAtoms::src) ||
-      (type == nsHTMLAtoms::object && aAttribute == nsHTMLAtoms::data)) {
+  if (((type != nsHTMLAtoms::object && aAttribute == nsHTMLAtoms::src) ||
+       (type == nsHTMLAtoms::object && aAttribute == nsHTMLAtoms::data)) &&
+      mOwnsFrameLoader) {
     nsHTMLFrameInnerFrame* firstChild =
       NS_STATIC_CAST(nsHTMLFrameInnerFrame*, mFrames.FirstChild());
 
diff --git a/mozilla/layout/html/document/src/nsFrameFrame.cpp b/mozilla/layout/html/document/src/nsFrameFrame.cpp
index 2c7fa1b714c..56dfa7fab3b 100644
--- a/mozilla/layout/html/document/src/nsFrameFrame.cpp
+++ b/mozilla/layout/html/document/src/nsFrameFrame.cpp
@@ -552,8 +552,9 @@ nsHTMLFrameOuterFrame::AttributeChanged(nsIPresContext* aPresContext,
   nsCOMPtr<nsIAtom> type;
   aChild->GetTag(*getter_AddRefs(type));
 
-  if ((type != nsHTMLAtoms::object && aAttribute == nsHTMLAtoms::src) ||
-      (type == nsHTMLAtoms::object && aAttribute == nsHTMLAtoms::data)) {
+  if (((type != nsHTMLAtoms::object && aAttribute == nsHTMLAtoms::src) ||
+       (type == nsHTMLAtoms::object && aAttribute == nsHTMLAtoms::data)) &&
+      mOwnsFrameLoader) {
     nsHTMLFrameInnerFrame* firstChild =
       NS_STATIC_CAST(nsHTMLFrameInnerFrame*, mFrames.FirstChild());