Mod caused "non-recoverable error" -- possibly due to invalid surface setting in a position. (Feature suggestion: "copy player x/y" should copy surface as well.) I was trying to take screenshots of a Factorissimo 2 interior. When the surface name didn't do anything, I tried the id; a little while later (the next time it went to take screenshots, I assume), this error occurred.

Error while running event CredoTimeLapseModByMaessigcremig::on_tick (ID 0)
CredoTimeLapseModByMaessigcremig/CTLM/main.lua:149: attempt to index field '?' (a nil value)
stack traceback:
CredoTimeLapseModByMaessigcremig/CTLM/main.lua:149: in function <CredoTimeLapseModByMaessigcremig/CTLM/main.lua:99>