--- a/js/src/jsfun.cpp
+++ b/js/src/jsfun.cpp
@@ -1050,20 +1050,23 @@ js_fun_apply(JSContext *cx, unsigned arg
 
         if (!args.init(length))
             return false;
 
         /* Push fval, obj, and aobj's elements as args. */
         args.setCallee(fval);
         args.setThis(vp[2]);
 
+        // Make sure the function is delazified before querying its arguments.
+        if (args.callee().is<JSFunction>()) {
+            JSFunction *fun = &args.callee().as<JSFunction>();
+            if (fun->isInterpreted() && !fun->getOrCreateScript(cx))
+                return false;
+        }
         /* Steps 7-8. */
-        JSFunction *fun = &args.callee().as<JSFunction>();
-        if (fun->isInterpreted() && !fun->getOrCreateScript(cx))
-            return false;
         if (!GetElements(cx, aobj, length, args.array()))
             return false;
     }
 
     /* Step 9. */
     if (!Invoke(cx, args))
         return false;