Ascii code can't decode

[hamperfait]

I'm running on Ubuntu, and when running ./Responder.py
When capturing hashes, the first time it works and gives me the username and hash, but from then it always says the same:
UnicodeDecodeError: 'ascii' codec can't decode byte 0xe1 in position 7: ordinal not in range(128)
When running locale, I have it set to UTF-8.
Any clues what might be going wrong?

[0xsauby]

This Responder repo isn't maintained anymore. Get the latest code here - https://github.com/lgandx/Responder