diff --git a/mozilla/layout/html/base/src/nsHTMLImage.h b/mozilla/layout/html/base/src/nsHTMLImage.h
index 3bd05ad50e9..300395e9848 100644
--- a/mozilla/layout/html/base/src/nsHTMLImage.h
+++ b/mozilla/layout/html/base/src/nsHTMLImage.h
@@ -53,7 +53,9 @@ public:
   nsresult SetBaseHREF(const nsString& aBaseHREF);
 
   void GetURL(nsString& aResult) {
-    aResult = *mURLSpec;
+    if (nsnull != mURLSpec) {
+      aResult = *mURLSpec;
+    }
   }
 
   void GetBaseHREF(nsString& aResult) {