Guake terminal does not drop down with F12 after upgrade

after a recent upgrade on my local Debian install Guake does not drop down by using F12 Operating System: Debian GNU/Linux buster/sid Kernel: Linux 4.12.0-1-686-pae Architecture: x86 Guake version: 0.8.8-1 once I started it manually I can call it with F12, but only on the virtual desktop where it was started, as soon as I change do a different desktop I can't call it with F12 anymore. As you can see on the screenshot, I'm on the 2ond desktop and in the bottom left the guake symbol shows up. I can call the terminal by clicking there with the mouse. But F12 does not work. If I start it from a terminal I get the following output: (guake:3387): libglade-WARNING **: unknown attribute `swapped' for . INFO:guake.guake_app:Logging configuration complete /usr/lib/python2.7/dist-packages/guake/guake_app.py:865: GtkWarning: IA__gtk_window_set_type_hint: assertion '!gtk_widget_get_mapped (GTK_WIDGET (window))' failed self.window.set_type_hint(gtk.gdk.WINDOW_TYPE_HINT_DOCK) /usr/lib/python2.7/dist-packages/guake/guake_app.py:866: GtkWarning: IA__gtk_window_set_type_hint: assertion '!gtk_widget_get_mapped (GTK_WIDGET (window))' failed self.window.set_type_hint(gtk.gdk.WINDOW_TYPE_HINT_NORMAL) ^CTraceback (most recent call last): File "/usr/lib/python2.7/runpy.py", line 174, in _run_module_as_main "__main__", fname, loader, pkg_name) File "/usr/lib/python2.7/runpy.py", line 72, in _run_code exec code in run_globals File "/usr/lib/python2.7/dist-packages/guake/main.py", line 253, in exec_main() File "/usr/lib/python2.7/dist-packages/guake/main.py", line 250, in exec_main gtk.main()