Bug:Messages can be sent without logging in.

**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**