diff --git a/lib/client.js b/lib/client.js
index 0877d16b..0145ec6a 100644
--- a/lib/client.js
+++ b/lib/client.js
@@ -126,10 +126,10 @@ var Util, DOM, CloudFunc;
                         Util.exec(doBefore);
                         
                         return DOM.load.js(pathFull, func ||
-                            function() {
+                            function(error) {
                                 var Proto = CloudCmd[name];
                                 
-                                if (Util.isFunction(Proto))
+                                if (!error && Util.isFunction(Proto))
                                     CloudCmd[name] = Util.applyConstructor(Proto, args);
                             });
                     };