Unknown error for 6 lights Google Assistant

When I ask Hassio via Google assistant “Which lights are on” I get back Unknown error for 6 lights. Looking in the logs of Hassio I see the following;

What could it be?

2018-06-25 21:56:49 ERROR (MainThread) [homeassistant.components.google_assistant.smart_home] Unexpected error
Traceback (most recent call last):
  File "/usr/lib/python3.6/site-packages/homeassistant/components/google_assistant/smart_home.py", line 217, in _process
    result = await handler(hass, config, inputs[0].get('payload'))
  File "/usr/lib/python3.6/site-packages/homeassistant/components/google_assistant/smart_home.py", line 274, in async_devices_query
    devices[devid] = _GoogleEntity(hass, config, state).query_serialize()
  File "/usr/lib/python3.6/site-packages/homeassistant/components/google_assistant/smart_home.py", line 158, in query_serialize
    deep_update(attrs, trt.query_attributes())
  File "/usr/lib/python3.6/site-packages/homeassistant/components/google_assistant/trait.py", line 322, in query_attributes
    color_util.color_temperature_mired_to_kelvin(temp)
  File "/usr/lib/python3.6/site-packages/homeassistant/util/color.py", line 478, in color_temperature_mired_to_kelvin
    return math.floor(1000000 / mired_temperature)
ZeroDivisionError: division by zero
2018-06-25 21:56:49 ERROR (MainThread) [homeassistant.components.google_assistant.smart_home] Error handling message {'inputs': [{'intent': 'action.devices.QUERY', 'payload': {'devices': [{'id': 'light.living_room__corner_table'}, {'id': 'light.living_room'}, {'id': 'light.living_room__rack'}, {'id': 'light.light_4'}, {'id': 'group.all_lights'}, {'id': 'light.living_room__couch'}]}}], 'requestId': '6531916141289625278'}: {'errorCode': 'unknownError'}

What version (number) of Home Assistant?

Version 109 (latest)

That’s not the version of Home Assistant, which has only just reached 0.72.

That’s the version of Supervisor…

Oops… It’s version 0.72.0