Guake hangs when exit on Ubuntu 18

Guake is a dropdown terminal made for the GNOME desktop environment. Guake's style of window is based on an FPS game, and one of its goals is to be easy to reach. Recently, my new Ubuntu 18.04 LTS is meeting a bug. When I was trying to exit a shell, the Guake would hang over there, which makes this application even unable to use.