I've also experienced this bug while changing cleric.
For some reason, my cleric continually goes around and heals my other hearthlings, neglecting both their own health and their hunger and sleep levels, effectively working themselves to death, even after I turn off their job button under managements. I have to put them back to being a worker in order to keep them from dying, which is when I experience this error.
My exact steps leading up to this error are as followed:
Playing hard mode,
Multiple injured hearthlings
Promoted best herbalist to cleric
Cleric worked self to near death before I noticed they werent eating
Tried turning off their job option to force them to take a break
Kept healing others constantly, regardless.
Demoted to worker, got this error.
Later I tried to demote them to herbalist and got the same error.