Qtile crash exception

gistfile1.pytb

2012-09-07 18:10:04,415 ERROR _xpoll:1086 Got an exception in poll loop
Traceback (most recent call last):
  File "/usr/local/lib/python2.7/dist-packages/qtile-0.5-py2.7.egg/libqtile/manager.py", line 1082, in _xpoll
    r = h(e)
  File "/usr/local/lib/python2.7/dist-packages/qtile-0.5-py2.7.egg/libqtile/manager.py", line 1325, in handle_MapRequest
    c = self.manage(w)
  File "/usr/local/lib/python2.7/dist-packages/qtile-0.5-py2.7.egg/libqtile/manager.py", line 981, in manage
    hook.fire("client_new", c)
  File "/usr/local/lib/python2.7/dist-packages/qtile-0.5-py2.7.egg/libqtile/hook.py", line 185, in fire
    i(*args, **kwargs)
  File "/home/derek/.config/qtile/config.py", line 244, in floating_dialogs
    dialog = window.window.get_wm_type() == 'dialog'
  File "/usr/local/lib/python2.7/dist-packages/qtile-0.5-py2.7.egg/libqtile/xcbq.py", line 445, in get_wm_type
    r = self.get_property('_NET_WM_WINDOW_TYPE', "ATOM", unpack='I')
  File "/usr/local/lib/python2.7/dist-packages/qtile-0.5-py2.7.egg/libqtile/xcbq.py", line 540, in get_property
    0, (2 ** 32) - 1
BadWindow: <xcb.xproto.WindowError object at 0x2d2baa0>
2012-09-07 18:10:04,417 WARNING loop:1121 Got exception, Breaking main loop
2012-09-07 18:10:04,643 WARNING init_log:53 Starting Qtile