user name error

[spioli]

Hi,
We get this error from Meowgram log (and in the telegram chat) for some users while for some one else everything works properly.

2025-03-10 06:22:01 - ERROR - Error message received from Cheshire Cat: {'type': 'error', 'name': 'BadRequestError', 'description': 'Error code: 400 - {\'error\': {\'message\': "Invalid \'messages[1].name\': string does not match pattern. Expected a string that matches the pattern \'^[a-zA-Z0-9_-]+$\'.", \'type\': \'invalid_request_error\', \'param\': \'messages[1].name\', \'code\': \'invalid_value\'}}'}