app.js

@@ -95,13 +95,16 @@ async function initialize() {
     });
   }
 
+  const configExists = fs.existsSync("./config.json");
+  if (configExists) {
     readConfigFromFile();
     config.rooms.forEach(room => {
       addRoomToList(room);
     });
+  }
 
   const registerDiv = document.querySelector('#register');
-  if (registerDiv && config.userName !== '') {
+  if (registerDiv && !configExists) {
     registerDiv.classList.remove('hidden');
   }