Message send notification error

main.py

@@ -187,7 +187,7 @@ def handle_message_update(event_payload):
     title = 'Picturelock'
     body = f'@{username} sent you a message!'
     if token and user_id != author_id:
-        send_notification(title, body, token, user_id, id, "message")
+        send_notification(title, body, token, author_id, id, "message")
 
 def handle_listreply_update(event_payload):
     print('Received update in listreplies:')