[PvK]

Check the AI designs, maybe. The situation I know of happens in mods where the AI ends up illegally building designs which have no structure, and then send them into combat. When those units get hit, div-zero error. Happened in some versions of Proportions mod when the AI would design and build infantry with no components because it was trying to place large components on them that wouldn't fit on the vehicle size, so it made empty troops. Solution was to change the AI files so they didn't design troops like that. For specific games, the solution was to go in and check for AI-built units which had zero structure, and jettison/scrap them.

Might not be what's happening to you, though.

PvK