invalid literal for int() with base 10: '' for clause

[vncaragao]

When my code runs "for uid, message in all_inbox_messages:", shows invalid literal for int() with base 10: '' for clause Follows the log.

Exception in thread Thread-535:
Traceback (most recent call last):
File "/usr/local/lib/python3.8/threading.py", line 932, in _bootstrap_inner
self.run()
File "/usr/local/lib/python3.8/site-packages/flaskthreads/thread_helpers.py", line 191, in run
super().run()
File "/usr/local/lib/python3.8/threading.py", line 870, in run
self._target(*self._args, **self._kwargs)
File "/usr/src/app/app/views/omnimail/controllers/ListEmails.py", line 33, in run
Email.list(config)
File "/usr/src/app/app/entities/Email.py", line 68, in list
for uid, message in all_inbox_messages:
File "/usr/local/lib/python3.8/site-packages/imbox/messages.py", line 55, in _fetch_email_list
yield uid, self._fetch_email(uid)
File "/usr/local/lib/python3.8/site-packages/imbox/messages.py", line 42, in _fetch_email
return fetch_email_by_uid(uid=uid,
File "/usr/local/lib/python3.8/site-packages/imbox/parser.py", line 155, in fetch_email_by_uid
email_object = parse_email(raw_email, policy=parser_policy)
File "/usr/local/lib/python3.8/site-packages/imbox/parser.py", line 212, in parse_email
attachment = parse_attachment(part)
File "/usr/local/lib/python3.8/site-packages/imbox/parser.py", line 122, in parse_attachment
filename_parts.insert(int(s_name[1]),value[1:-1] if value.startswith('"') else value)
ValueError: invalid literal for int() with base 10: ''

[vncaragao]

I changed the 122th row, mocking a fixed value, works. But i need help.