core: AttributeError: module 'homeassistant.components.automation.sun' has no attribute 'ENTITY_ID'

The problem

I see this error returning in my logging:

AttributeError: module 'homeassistant.components.automation.sun' has no attribute 'ENTITY_ID'
2020-02-06 00:55:53 ERROR (MainThread) [homeassistant.components.websocket_api.http.connection.140352393080528] Error handling message: Unknown error
Traceback (most recent call last):
  File "/usr/src/homeassistant/homeassistant/components/websocket_api/decorators.py", line 20, in _handle_async_response
    await func(hass, connection, msg)
  File "/usr/src/homeassistant/homeassistant/components/search/__init__.py", line 49, in websocket_search_related
    msg["id"], searcher.async_search(msg["item_type"], msg["item_id"])
  File "/usr/src/homeassistant/homeassistant/components/search/__init__.py", line 89, in async_search
    getattr(self, f"_resolve_{search_type}")(search_id)
  File "/usr/src/homeassistant/homeassistant/components/search/__init__.py", line 163, in _resolve_entity
    for entity in automation.automations_with_entity(self.hass, entity_id):
  File "/usr/src/homeassistant/homeassistant/components/automation/__init__.py", line 136, in automations_with_entity
    if entity_id in automation_entity.referenced_entities:
  File "/usr/src/homeassistant/homeassistant/components/automation/__init__.py", line 321, in referenced_entities
    for entity_id in _trigger_extract_entities(conf):
  File "/usr/src/homeassistant/homeassistant/components/automation/__init__.py", line 581, in _trigger_extract_entities
    return [sun.ENTITY_ID]
AttributeError: module 'homeassistant.components.automation.sun' has no attribute 'ENTITY_ID'

Any idea what might be wrong?

Environment

I’m running Home-Assistant core: 0.105.0 This error did not occur in previous version: 0.104.3 I’m running it in a Docker on a Synology Server

Problem-relevant configuration.yaml

Traceback/Error logs

Additional information