From 8107791dabfb1f33e265b493a4d1352a5a91a71c Mon Sep 17 00:00:00 2001
From: Christoph Stahl <christoph.stahl@tu-dortmund.de>
Date: Mon, 18 Aug 2025 22:58:34 +0200
Subject: [PATCH] Check for correct usable data in client registration

---
 syng/server.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/syng/server.py b/syng/server.py
index 51d0720..6e0f67e 100644
--- a/syng/server.py
+++ b/syng/server.py
@@ -1447,7 +1447,7 @@ class Server:
         :return: True, if the room exist, False otherwise
         :rtype: bool
         """
-        if data["room"] in self.clients:
+        if "room" in data and data["room"] in self.clients:
             async with self.sio.session(sid) as session:
                 session["room"] = data["room"]
                 await self.sio.enter_room(sid, session["room"])