When loading a file with a tag containing null characters and this tag is used for sorting, then Picard crashes with:

(env) ~\devel\musicbrainz\picard [PICARD-1852-about-dialog]> python .\tagger.py
W: 16:20:30,547 ui.mainwindow.create_actions:529: CDROM: discid library not found - Lookup CD functionality disabled
Traceback (most recent call last):
File ".\picard\ui\itemviews.py", line 872, in _lt_
return self.sortkey(column) < other.sortkey(column)
File ".\picard\ui\itemviews.py", line 877, in sortkey
return natsort.natkey(self.text(column).lower())
File ".\picard\util\natsort.py", line 36, in natkey
return [int(s) if s.isdigit() else strxfrm(s)
File ".\picard\util\natsort.py", line 36, in <listcomp>
return [int(s) if s.isdigit() else strxfrm(s)
ValueError: embedded null character