AttributeError: 'NoneType' object has no attribute 'ack' (Not fixed with duplicate threads' solutions)

[StephenDeVita]

Summary

Bot runs as normal, occasionally crashes due to the NoneType error.

Reproduction Steps

Cannot consistently reproduce this. This error occurs around every 3 days.

Expected Results

Bot runs as usual with no problem.

Actual Results

Traceback (most recent call last):
File "D:/Downloads2/Pycharm projects/DiscordBot2/DiscordBot2.py", line 32, in
client.run('bot_token')
File "D:\Downloads2\Pycharm projects\DiscordBot2\lib\site-packages\discord\client.py", line 678, in run
return future.result()
File "D:\Downloads2\Pycharm projects\DiscordBot2\lib\site-packages\discord\client.py", line 658, in runner
await self.start(*args, **kwargs)
File "D:\Downloads2\Pycharm projects\DiscordBot2\lib\site-packages\discord\client.py", line 622, in start
await self.connect(reconnect=reconnect)
File "D:\Downloads2\Pycharm projects\DiscordBot2\lib\site-packages\discord\client.py", line 524, in connect
await self.ws.poll_event()
File "D:\Downloads2\Pycharm projects\DiscordBot2\lib\site-packages\discord\gateway.py", line 504, in poll_event
await self.received_message(msg.data)
File "D:\Downloads2\Pycharm projects\DiscordBot2\lib\site-packages\discord\gateway.py", line 401, in received_message
self._keep_alive.ack()
AttributeError: 'NoneType' object has no attribute 'ack'

Checklist

• I have searched the open issues for duplicates.

There are 2 duplicate threads with this issue: Thread1 and Thread2. However, the solutions presented in both of these threads do not solve the issue

• I have shown the entire traceback, if possible.
• I have removed my token from display, if visible.

System Information

• Python v3.8.6-final
• discord.py v1.5.1-final
• aiohttp v3.6.2
• system info: Windows 10 10.0.19041

[Rapptz]

Based on the traceback you've included with line numbers, this is not v1.5.1. In v1.5.1 it is impossible to run into this because there is a None check. Note that the ack happens in line 460, not 401 in the current version.

Please update your library in your virtual environment before making a duplicate issue.