diff --git a/src/models/challenge.js b/src/models/challenge.js
index d4362aeee2..31b70f50e7 100644
--- a/src/models/challenge.js
+++ b/src/models/challenge.js
@@ -69,7 +69,7 @@ ChallengeSchema.methods.isOutdated = function(newData) {
  * @return nothing, user is modified directly. REMEMBER to save the user!
  */
 ChallengeSchema.methods.syncToUser = function(user, cb) {
-  if (!user) return;
+  if (!user) return cb();
   var self = this;
   self.shortName = self.shortName || self.name;