diff --git a/src/user/data.js b/src/user/data.js
index 04c6d0e999..66fedbefcd 100644
--- a/src/user/data.js
+++ b/src/user/data.js
@@ -94,7 +94,7 @@ module.exports = function(User) {
 				return;
 			}
 
-			user.username = validator.escape(user.username || '');
+			user.username = validator.escape(user.username ? user.username.toString() : '');
 
 			if (user.password) {
 				user.password = undefined;