'NoneType' object has no attribute 'connect'

[Smawexi]

Code that causes the issue

empty

Expected behavior

empty

Actual behavior

reconnect error

Traceback

Unexpected exception reconnecting on attempt 6
Traceback (most recent call last):
File "D:\miniconda\lib\site-packages\telethon\network\mtprotosender.py", line 378, in _reconnect
await self._connect()
File "D:\miniconda\lib\site-packages\telethon\network\mtprotosender.py", line 234, in _connect
connected = await self._try_connect(attempt)
File "D:\miniconda\lib\site-packages\telethon\network\mtprotosender.py", line 284, in _try_connect
await self._connection.connect(timeout=self._connect_timeout)
AttributeError: 'NoneType' object has no attribute 'connect'

Telethon version

1.37

Python version

3.9

Operating system (including distribution name and version)

Windows10

Other details

No response

Checklist

• The error is in the library's code, and not in my own.
• I have searched for this issue before posting it and there isn't an open duplicate.
• I ran pip install -U https://github.com/LonamiWebs/Telethon/archive/v1.zip and triggered the bug in the latest version.