Nicotine+ is a fork of nicotine, a Soulseek client in Python.
Nicotine+ does not sufficiently validate file path in download requests.
A file path in a download request which contains a null character will cause a crash of Nicotine+.
There is no known workaround at this time.
All Nicotine+ users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=net-p2p/nicotine+-3.2.1"