Description of problem:
Error occured after login to system (during gnome shell startup).

Version-Release number of selected component:
guake-0.4.4-11.fc20

Additional info:
reporter:       libreport-2.1.11
cmdline:        python /usr/bin/guake
executable:     /usr/bin/guake
kernel:         3.12.6-300.fc20.x86_64
runlevel:       N 5
type:           Python
uid:            1000

Truncated backtrace:
guake:640:__init__:TypeError: Gtk.accelerator_parse() argument 1 must be string, not None

Traceback (most recent call last):
  File "/usr/bin/guake", line 1446, in <module>
    if not main():
  File "/usr/bin/guake", line 1390, in main
    instance = Guake()
  File "/usr/bin/guake", line 640, in __init__
    keyval, mask = gtk.accelerator_parse(key)
TypeError: Gtk.accelerator_parse() argument 1 must be string, not None

Local variables in innermost frame:
colormap: <gtk.gdk.Colormap object at 0x2807280 (GdkColormap at 0x286e3f0)>
img: '/usr/share/pixmaps/guake/guake-tray.png'
evtbox: <gtk.EventBox object at 0x27fa960 (GtkEventBox at 0x285b050)>
screen: <gtk.gdk.ScreenX11 object at 0x2807190 (GdkScreenX11 at 0x24cb150)>
ipath: '/usr/share/pixmaps/guake/add_tab.png'
hide_context_menu: <function hide_context_menu at 0x28041b8>
key: None
destroy: <function destroy at 0x2804230>
self: Guake(path="/usr/share/guake/guake.glade")
double_click: <function double_click at 0x2804140>