The larger of HenK's sims isn't a divide by zero, it's an overflow. A bunch of bots in the sim have ridiculously high position values. The overflow occurs when these Single valued position coordinates get assigned to a local Long in the bot drawing routine. This is where the crash occurs, but the root of the bug happened a while back in the cycle when those wacky positions got calculated.
Debugging these kind of problems where the crash happens long after the actual bug can be a bitch. My theory is that there is an issue with the way the intrasim teleporter chooses a new random positions. Both the X and Y position values of the bot have wacky values and there are several bots that all got wacky values that cycle. This points to the intrasim teleporter as your sim includes a large one capable of teleporting a bunch of bots all in the same cycle.
Testlund, does your sim include a intrasim teleporter?
Henk, the other error.sim you posted crashes because the field dimensions are 0. Got any more info on this sim?