[geoschmo]

You could also try processing the turn again offline several more times, but each time eliminating one of the .plr files before running it. By this process of elimination you may be able to figure out which players turn file is causing the problem. It doesn't always work, but it's a start.

Once you narrow it down to the player, you still have the problem of what they are doing that's causign the error. It's probably nothing they are doing that's illegal or anything. Just a fluke like PhoenixD says.

We used to get divide by zero errors when a ship rammed a planet in combat, or when a player hit mines that had been designed with no warheads, or when you tried to colonize a planet in sector 0,0 of a system. But I believe all of those bugs have been patched out.