what on earth is going wrong here? (experimental overlay)

https://preview.redd.it/kefuu0klr87h1.png?width=399&format=png&auto=webp&s=ed69f67220acf6a05d29819ad3296ae31227dac8

ive taken to fixing my own games and its going very smoothly, except for some reason a few games cause this error when i open the overlay/get an achievement and it crashes the game

not every game
only happens when the game is added to steam as non-steam game