After effects have had this problem forever. If you have something copied to your clipboard from illustrator ( path, shape, anything, right click > copy ) and you go to your After effects window and AE starts autosave, after effects will crash. Sometimes it manages to show error message, most of the time not. You'll lose any changes you've made.
Adobe programs should work together smoothly, would make more sense if you can copy paste shapes straight from illustrator to after effects without any reroutes.
It's called Auto Save not Auto Destroyer :D!