only look at 329 when it's a channel we know we are in

src/core_modules/line_handler/channel.py

@@ -123,6 +123,7 @@ def handle_324(events, event):
             args_str=args)
 
 def handle_329(event):
+    if event["line"].args[1] in event["server"].channels:
         channel = event["server"].channels.get(event["line"].args[1])
         channel.creation_timestamp = int(event["line"].args[2])