Note that this bug p[robably doesn't occur often, it happened because i had a LOT of spelopedes spawned and many of them were performing the same job.
Still, it exposed a possible bug with some other function so i figured i would share it.
(http://i.imgur.com/oUIdTxS.jpg)
Thank you for the bug report. Is it possible for you to attach the output_log.txt (or Player.log) file for this error? As it's a lot more useful, and contains more information, than a screenshot of the debug log.