diff --git a/js/jsd/jsd_xpc.cpp b/js/jsd/jsd_xpc.cpp
index 97db7016e79c..a09c1da649c8 100644
--- a/js/jsd/jsd_xpc.cpp
+++ b/js/jsd/jsd_xpc.cpp
@@ -464,6 +464,15 @@ jsds_FilterHook (JSDContext *jsdc, JSDThreadState *state)
 JS_STATIC_DLL_CALLBACK (void)
 jsds_NotifyPendingDeadScripts (JSContext *cx)
 {
+    /* Bug 411249, we can't drop the script hook.
+     * Even if we could drop the script hook, jsds_GCCallbackProc
+     * is never cleared, so it would call us anyway.
+     *
+     * If there's no gJsds, then we can't do anything.
+     */
+    if (!gJsds)
+        return;
+
     nsCOMPtr<jsdIScriptHook> hook = 0;   
     gJsds->GetScriptHook (getter_AddRefs(hook));