When one choses to quit Pybliographic and any change has been made, a nice window appears asking if the user wishes to save the changes. There is however no option to cancel the quit, only to save or don't save.
Maybe an user doesn't remember the changes he made and wants to make sure before saving. Or the user doesn't actually wants to quit the program, he was just trying to maximize the window, the mouse slipped and he pressed the close window button instead (happened to me).
Also, I'm using version 1.2.11