Bug:Messages can be sent without logging in.

[cmgyqjj]

Bug Description
The messages will be sent without the need for logging in when a login attempt is repeated by someone.
If the command :olu is used, it will be observed that it does not display your user ID, despite the ability to send messages.

Can I submit a Pull Request (PR) to fix the bug?

Reproduce
step:

1. route.start()
2. server.start()
3. client1.start() and user1.login()
4. client2.start() and user1.login()
5. client2.stop()
6. user1.sendMessage()

Expected results
The message can be sent by logged-in users; users who are not logged in cannot send messages.

Screenshot