diff --git a/libs/mysql.js b/libs/mysql.js
index 2819e88..70cf3cf 100644
--- a/libs/mysql.js
+++ b/libs/mysql.js
@@ -42,7 +42,7 @@ function getGame(gameid) {
 function addHelper(username, gameid) {
   return new Promise((resolve, reject) => {
     con.query(
-      `UPDATE games SET helpers = JSON_ARRAY_APPEND(helpers, '$', ${username}) WHERE id = ${gameid}`,
+      `UPDATE games SET helpers = JSON_ARRAY_APPEND(helpers, '$', "${username}") WHERE id = ${gameid}`,
       (error, result) => {
         if (error) {
           reject(new Error(error));
@@ -56,7 +56,7 @@ function addHelper(username, gameid) {
 function removeHelper(username, gameid) {
   return new Promise((resolve, reject) => {
     con.query(
-      `UPDATE games SET helpers = JSON_REMOVE(helpers, JSON_UNQUOTE(JSON_SEARCH(helpers, 'one', ${username}))) WHERE id = ${gameid}`,
+      `UPDATE games SET helpers = JSON_REMOVE(helpers, JSON_UNQUOTE(JSON_SEARCH(helpers, 'one', "${username}"))) WHERE id = ${gameid}`,
       (error, result) => {
         if (error) {
           reject(new Error(error));