Traceback (most recent call last):


 "/home/florian/proj/qutebrowser/git/qutebrowser/utils/objreg.py", line 200, in _get_window_registry

return win.registry
AttributeError: 'NoneType' object has no attribute 'registry'

Traceback (most recent call last):


 "/usr/homeassistant/lib/python3.5/site-packages/homeassistant/helpers/entity_component.py", line 189, in _async_setup_platform

SLOW_SETUP_MAX_WAIT, loop=self.hass.loop)


 "/usr/lib/python3.5/asyncio/tasks.py", line 392, in wait_for

return fut.result()


 "/usr/lib/python3.5/asyncio/futures.py", line 274, in result

raise self._exception


 "/usr/lib/python3.5/concurrent/futures/thread.py", line 55, in run

result = self.fn(*self.args, **self.kwargs)


 "/usr/homeassistant/lib/python3.5/site-packages/homeassistant/components/calendar/caldav.py", line 98, in setup_platform

WebDavCalendarEventDevice(hass, device_data, calendar)


 "/usr/homeassistant/lib/python3.5/site-packages/homeassistant/components/calendar/caldav.py", line 111, in __init__

super().__init__(hass, device_data)


 "/usr/homeassistant/lib/python3.5/site-packages/homeassistant/components/calendar/__init__.py", line 72, in __init__

self.update()


 "/usr/homeassistant/lib/python3.5/site-packages/homeassistant/components/calendar/__init__.py", line 138, in update

if not self.data or not self.data.update():


 "/usr/homeassistant/lib/python3.5/site-packages/homeassistant/util/__init__.py", line 306, in wrapper

result = method(*args, **kwargs)


 "/usr/homeassistant/lib/python3.5/site-packages/homeassistant/components/calendar/caldav.py", line 155, in update

and not self.is_over(event.instance.vevent))), None)


 "/usr/homeassistant/lib/python3.5/site-packages/homeassistant/components/calendar/caldav.py", line 155, in <genexpr>

and not self.is_over(event.instance.vevent))), None)


 "/usr/homeassistant/lib/python3.5/site-packages/homeassistant/components/calendar/caldav.py", line 197, in is_over

return dt.now() > WebDavCalendarData.to_datetime(vevent.dtend.value)


 "/usr/homeassistant/lib/python3.5/site-packages/vobject/base.py", line 531, in __getattr__

raise AttributeError(name)
AttributeError: dtend
