I've recently had someone point out that when they tried pressing the F12 key to make a screenshot during a death, the game bugged out and an error regarding a lighting effect script came up. I mimicked his gameplay process the way it was described to me and got the same result. However, I myself was able to exit out of the game completely, re-open it, and the error was no longer present.
My advice, don't use the F12 key to make screenshots. I know you can make a screenshot with the windows key + PrtSc button. If any other errors come up, please alert me.