diff --git a/lib/client.js b/lib/client.js
index 61882fe1..aa5aed04 100644
--- a/lib/client.js
+++ b/lib/client.js
@@ -326,9 +326,6 @@ var Util, DOM, CloudFunc, join;
                 options     = {};
             }
             
-            if (typeof callback !== 'function')
-                throw(Error('callback should be function!'));
-            
             CloudCmd.loadDir({
                 path        : notSlashlLink,
                 isRefresh   : NEEDREFRESH,