diff --git a/src/topics/tags.js b/src/topics/tags.js
index f113720dfa..bb982ee3ef 100644
--- a/src/topics/tags.js
+++ b/src/topics/tags.js
@@ -9,6 +9,8 @@ var async = require('async'),
 module.exports = function(Topics) {
 
 	Topics.createTags = function(tags, tid, timestamp, callback) {
+		callback = callback || function () {};
+
 		if (!Array.isArray(tags) || !tags.length) {
 			return callback();
 		}