The crash is caused by libepoxy GL functions pointing to nullptrs. libepoxy "Automatically initializes as new GL functions are used.", so to call a function without a GL context bound, the function must have been called before with a bound context. This PR ensures there's a valid GL context bound for the whole `WM_exit` scope. (4.5 backport candidate) Pull Request: https://projects.blender.org/blender/blender/pulls/144572