diff --git a/app.js b/app.js
index 6e22396..33244f5 100644
--- a/app.js
+++ b/app.js
@@ -131,8 +131,12 @@ io.on("connection", (socket) => {
   console.log("Spieler verbunden");
 
   socket.on("register", (username) => {
-    socket.user = username;
-    onlineUsers[username] = socket.id;
+    const name = String(username);
+
+    socket.user = name;
+
+    onlineUsers[name] = socket.id;
+
     io.emit("onlineUsers", Object.keys(onlineUsers));
   });
 
diff --git a/public/js/chat.js b/public/js/chat.js
index c693241..1713cd4 100644
--- a/public/js/chat.js
+++ b/public/js/chat.js
@@ -1,5 +1,5 @@
 const socket = io();
-socket.emit("register", window.playerName);
+socket.emit("register", String(window.playerName));
 const chatTitle = document.getElementById("chat-title");
 
 let channel = "global";