1 files changed, 1 insertions, 0 deletions
diff --git a/models/users.js b/models/users.js
index ee53c7ab..9147322c 100644
--- a/models/users.js
+++ b/models/users.js
@@ -541,6 +541,7 @@ Users.mutations({
 Meteor.methods({
   setUsername(username, userId) {
     check(username, String);
+    check(userId, String);
     const nUsersWithUsername = Users.find({ username }).count();
     if (nUsersWithUsername > 0) {
       throw new Meteor.Error('username-already-taken');