Solving error associated with object_terrain and looping

Hi, I was wondering if anyone has run into a similar problem. I'm trying to bugfix an object (robot) in the game that's supposed to go to a new location and then stop. The robot will successfully travel to the proper location, but when it gets there it doesn't recognize that it's in that spot and if I manually move it it will go back to the original location. It generates a last exception when it arrives.

The error message I've gotten:

AttributeError: 'object_terrain' object has no attribute 'is_on_location_changed_callback_registered), CategoryID:_init_:202, which I can't really parse at all.

My modding knowledge is at about the level of editing tuning files so I'm not really sure how to fix this. Is there a way fix this bug, or at least work around it?