What is the parent actor type of your AI class? There was an issue in 4.6 and earlier where using AIMoveTo would crash if the actor wasn’t a Character or similar (might have just been if it didn’t have a MovementComponent, but I don’t remember exactly), as it couldn’t find the AgentSettings or something like that.
If it’s not a Character, reparenting to that might help.
Cheers,
Michael Noland