This is a very random and mostly unreproducable problem, but basically if you try to open the timing setup panel in the editor, if the panel hangs the game will crash. This has happened to me many times, and ive noticed that it tends to happen whenever you have a great deal of unsaved edits, particular unsaved timing or inheritance points.
osu! version: Stable 20181231.2 (latest)
osu! version: Stable 20181231.2 (latest)