https://github.com/libsdl-org/SDL/blob/559223ff9dbd7893ad26de5ba4d0847d758bc1e3/src/core/linux/SDL_evdev.c#L542

for evdev SDL intentionally doesn't assign a window to the touch event due to limitations with the API

in lite-xl this curently causes a crash in system.c because it attempts to find a RenWindows that doesn't exist and then performs a null dereference

How should this be handled?

Dropping the event would be the sanest, however that mean that certain, very unique setups, have absolutely no input support.

An alternative would be simply get the first window from the window list and use that