Caldav error in 0.109

I have just testing caldav on my hassio installation running 0.109.
Caldav server access works when used from eg calendar app on macos.
However, in ha it doesn’t. The debug log shows:

2020-04-30 12:27:27 ERROR (MainThread) [homeassistant.components.calendar] caldav: Error on device update!
Traceback (most recent call last):
  File "/usr/src/homeassistant/homeassistant/helpers/", line 322, in _async_add_entity
    await entity.async_device_update(warning=False)
  File "/usr/src/homeassistant/homeassistant/helpers/", line 472, in async_device_update
    await self.hass.async_add_executor_job(self.update)
  File "/usr/local/lib/python3.7/concurrent/futures/", line 57, in run
    result = self.fn(*self.args, **self.kwargs)
  File "/usr/src/homeassistant/homeassistant/components/caldav/", line 143, in update
  File "/usr/src/homeassistant/homeassistant/util/", line 240, in wrapper
    result = method(*args, **kwargs)
  File "/usr/src/homeassistant/homeassistant/components/caldav/", line 206, in update
    vevent = event.instance.vevent
AttributeError: 'NoneType' object has no attribute 'vevent'

I have events in the calendar… So I am not sure where to search.
I have put the logger to debug level, not more detail.

Clues welcome!

I’ve the same problem - have you managed to find a solution?
I’m running hassio 0.113.2 and trying to get events from my godaddy calendar.

No. I gave up. I went for the google calendar integration that works flawlessly… Sorry.