diff --git a/lib/server/rest.js b/lib/server/rest.js
index 7476deff..049940ac 100644
--- a/lib/server/rest.js
+++ b/lib/server/rest.js
@@ -70,8 +70,8 @@
                 });
             }
         }
-        if (!ret)
-            Util.exec(callback);
+        if (!ret && callback)
+            callback();
         
         return ret;
     };