only attach reference message if not already known

discollama.py

@@ -103,7 +103,7 @@ async def on_message(message):
       if reference := message.reference:
         if session := load_session(message.reference):
           context = session.get('context', [])
-
+        else:
           reference_message = await message.channel.fetch_message(
             reference.message_id)
           reference_content = reference_message.content