diff --git a/core/user.js b/core/user.js
index 307dbacc..0121133a 100644
--- a/core/user.js
+++ b/core/user.js
@@ -473,7 +473,9 @@ module.exports = class User {
             return this.removeProperty(name, next);
         },
         err => {
-            return cb(err);
+            if(cb) {
+                return cb(err);
+            }
         });
     }