Why does the bot disconnect with an error when sending a message?

Question

Python

There is the following code, which outputs the bot's events to the console:

def start(self):
        for event in self.long_poll.listen():
            print(event)

If you just type something in the dialog, then the event is listened to correctly:

<({'type': 'message_typing_state', 'object': {'state': 'typing', 'from_id': ######, 'to_id': -######}, 'group_id ': ######})>

But as soon as you send a message, an error occurs:
TypeError: '<' not supported between instances of 'NoneType' and 'int'

Answer 1

This is a bug . It is treated by changing the API version.