So a random NPC turned up, told me to piss off, and stole a bunch of stuff from my vehicle. Needless to say I was not keen on this development. Looking at the space where she fell I get debug messages about a non-existent faction (probably because the last member died?).
DEBUG : Requested non-existing faction ‘solo_Bonnie McLean’
FUNCTION : faction* faction_manager::get(const faction_id&, bool)
FILE : src/faction.cpp
LINE : 427