Hi Guys, i’ve had this issue for awhile now and i have had no luck whatsoever fixing it. Seems to be very hard for me to pinpoint what exactly is triggering it.
I have multiple AI pawns, all based off a single c++ class, which is based off character.cpp.
Each differnt type of AI pawn is a BP, parented to this c class.
This error comes up many times. I cannot quite pinpoint what is causing it.
If you trace this back in engine code when the pawn stands on top of something? it runs setbase. This then fails with this error.
So i have tried all 3 differnt settings for the “can step up on” option, which i thought might change the results, but it does not.
Pawns are pretty standard, with a mesh, and then a collision box that overlaps only player pawns, nothing special really, from the BT, the AI picks a random navigable location from the navmesh (ie UNavigationSystemV1::K2_GetRandomReachablePointInRadius(MyController, SearchOrigin, Loc, SearchRadius)), moves to it, then picks a new one…
I am wondering, if this is something that someone has come across before? This has to be either really complex, or something simple and stupid that i have done 
Any ideas appreciated,
Cheers!
(small edit: i just wanted to add, everything seems to be working 100%, and its just coming up with the warning)