ERROR (MainThread) [aiohttp.server] .... AttributeError: 'NoneType' object has no attribute 'lower'

I just update HA v.0.68.1 and get this error below
Any idea what’s wrong?

2018-05-17 01:43:37 ERROR (MainThread) [aiohttp.server] Error handling request
Traceback (most recent call last):
File “/usr/local/lib/python3.5/site-packages/aiohttp/web_protocol.py”, line 381, in start
resp = await self._request_handler(request)
File “/usr/local/lib/python3.5/site-packages/aiohttp/web_app.py”, line 322, in _handle
resp = await handler(request)
File “/usr/local/lib/python3.5/site-packages/aiohttp/web_middlewares.py”, line 88, in impl
return await handler(request)
File “/usr/local/lib/python3.5/site-packages/homeassistant/components/http/static.py”, line 68, in staticresource_middleware
return await handler(request)
File “/usr/local/lib/python3.5/site-packages/homeassistant/components/http/real_ip.py”, line 27, in real_ip_middleware
return await handler(request)
File “/usr/local/lib/python3.5/site-packages/homeassistant/components/http/auth.py”, line 28, in auth_middleware
return await handler(request)
File “/usr/local/lib/python3.5/site-packages/homeassistant/components/http/view.py”, line 101, in handle
result = handler(request, **request.match_info)
File “/usr/local/lib/python3.5/site-packages/homeassistant/components/emulated_hue/hue_api.py”, line 98, in get
entity = hass.states.get(entity_id)
File “/usr/local/lib/python3.5/site-packages/homeassistant/core.py”, line 661, in get
return self._states.get(entity_id.lower())
AttributeError: ‘NoneType’ object has no attribute ‘lower’

something might be wrong with an entity id that you are using and the hue component is erroring.