Internal furnace and battery system error

While you have internal furnace or battery system, eating batteries or organic material cause immediate game crash.

It happened on version 0.7.1-164-g989a9fc

Guessing it’s another case of missing or incorrectly specified material. If you’re carrying anything that has a material other than what is specified in materials.json and try to eat with internal furnace installed, the game will crash. Were you carrying any rare items or quest items, or items that have been added recently? Those are more likely to have slipped by unnoticed.