diff --git a/mozilla/network/module/nsNetStubs.cpp b/mozilla/network/module/nsNetStubs.cpp
index 009a948dce0..db3ce40aef3 100644
--- a/mozilla/network/module/nsNetStubs.cpp
+++ b/mozilla/network/module/nsNetStubs.cpp
@@ -424,7 +424,7 @@ void FE_SetRefreshURLTimer(MWContext *pContext, URL_Struct *URL_s)
       nsISupports* container;
 
       rv = pConn->pURL->GetContainer(&container);
-      if (rv == NS_OK) {
+      if (container && (rv == NS_OK)) {
         rv = container->QueryInterface(kRefreshURLIID, (void**)&IRefreshURL);
         if(NS_SUCCEEDED(rv)) {
           nsIURL* newURL;