iirc, Geografts from G8 don't work on G8.1 for some reason. That could be the issue here, as I tried putting a Geograft on a G8.1 figure and it spat out an error at me.
Well the fix for it was made by the author of the addon fyi. but wierdly my pc updated windows and as of now it is working without crashing when i render. i wonder if that is what fixed it or if there was something else that i am not aware of.