Amberclan "Borrowed Time" | Citizen disappeared

Sasha, Amberclan Envoy, asked to borrow my trapper for 2 days. After I submitted my trapper, an error code appeared and the hearthling disappeared from the world. Hearthling has nothing under “Activity” and “Focus Camera on Unit” doesn’t respond. I can’t change this Hearthlings job, to make it go to the stockpile to get a new tool, either.

Please assist soon. Thanks.