I've had that crop up with some assorted props while I worked on tminus. In particular, it involved the train missile prop (three missiles strapped together on a bed). The error was apparently tied to the prop as it would go away when I removed them. The coordinates had nothing to do with the issue, apparently.
Unfortunately, there was no way to tell what prop was causing the issue except by trial and error. That said, the error caused no obvious issues. So, it might not be something to worry about. Some maps have such props (like Dustbowl), so again it might not be affecting anything.
Wish I could provide more insight, but I hope that is a way to diagnose the problem.
*edit* Lampenpam beat me to it. Still, it looks to be the same issue.
~G