From d466e383d4c0902352a74b1aad790de6bfa32bdf Mon Sep 17 00:00:00 2001
From: Christoph Stahl <christoph.stahl@tu-dortmund.de>
Date: Mon, 21 Nov 2022 18:30:39 +0100
Subject: [PATCH] added error, if room does not exist

---
 syng/server.py | 15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)

diff --git a/syng/server.py b/syng/server.py
index 687196b..1cbf5e4 100644
--- a/syng/server.py
+++ b/syng/server.py
@@ -219,12 +219,15 @@ async def handle_config(sid, data):
 
 @sio.on("register-web")
 async def handle_register_web(sid, data):
-    async with sio.session(sid) as session:
-        session["room"] = data["room"]
-        sio.enter_room(sid, session["room"])
-    state = clients[session["room"]]
-
-    await sio.emit("state", state.queue.to_dict(), room=sid)
+    if data["room"] in clients:
+        async with sio.session(sid) as session:
+            session["room"] = data["room"]
+            sio.enter_room(sid, session["room"])
+        state = clients[session["room"]]
+        await sio.emit("state", state.queue.to_dict(), room=sid)
+        return True
+    else:
+        return False
 
 
 @sio.on("register-admin")