Automations not working anymore with hue devices

Since the latest update, all my automations that contain hue lights aren’t working anymore. The automation triggers correctly, but doesn’t do anything.

Example Automation I’m using:

- alias: "Harmony Film Aktivität"
  initial_state: 'on'
  trigger:
    platform: state
    entity_id: remote.wohnzimmer
  condition:
    condition: or
    conditions:
      - condition: template
        value_template: '{{ trigger.to_state.attributes.current_activity == "Fire TV sehen" }}'
      - condition: template
        value_template: '{{ trigger.to_state.attributes.current_activity == "Blu-Rays" }}'
      - condition: template
        value_template: '{{ trigger.to_state.attributes.current_activity == "Heimkino" }}'
  action:
    - service: light.turn_off
      entity_id:
        - light.wohnzimmer
        - light.deckenlampe
    - service: switch.turn_on
      entity_id:
        - switch.66376420ecfabc2a8296_1
        - switch.66376420ecfabc2a8296_2
    - service: light.turn_on
      entity_id:
        - light.led_leiste
      data:
        brightness: 255
    - service: light.turn_on
      entity_id:
        - light.leinwand
    - service: automation.turn_on
      entity_id:
        - automation.flurlicht_einschalten_wahrend_kinobetrieb
    - service: automation.turn_off
      entity_id:
        - automation.flurlicht_einschalten_wenn_bewegung

I get the following error in my log files:

Error while executing automation automation.harmony_film_aktivitat. Unknown error for call_service at pos 1: 
Traceback (most recent call last):
  File "/usr/local/lib/python3.7/site-packages/homeassistant/components/automation/__init__.py", line 375, in action
    await script_obj.async_run(variables, context)
  File "/usr/local/lib/python3.7/site-packages/homeassistant/helpers/script.py", line 131, in async_run
    await self._handle_action(action, variables, context)
  File "/usr/local/lib/python3.7/site-packages/homeassistant/helpers/script.py", line 210, in _handle_action
    action, variables, context)
  File "/usr/local/lib/python3.7/site-packages/homeassistant/helpers/script.py", line 299, in _async_call_service
    context=context
  File "/usr/local/lib/python3.7/site-packages/homeassistant/helpers/service.py", line 85, in async_call_from_config
    domain, service_name, service_data, blocking=blocking, context=context)
  File "/usr/local/lib/python3.7/site-packages/homeassistant/core.py", line 1133, in async_call
    self._execute_service(handler, service_call))
  File "/usr/local/lib/python3.7/site-packages/homeassistant/core.py", line 1155, in _execute_service
    await handler.func(service_call)
  File "/usr/local/lib/python3.7/site-packages/homeassistant/helpers/entity_component.py", line 188, in handle_service
    self._platforms.values(), func, call, service_name
  File "/usr/local/lib/python3.7/site-packages/homeassistant/helpers/service.py", line 278, in entity_service_call
    future.result()  # pop exception if have
  File "/usr/local/lib/python3.7/site-packages/homeassistant/helpers/service.py", line 292, in _handle_service_platform_call
    await getattr(entity, func)(**data)
  File "/usr/local/lib/python3.7/site-packages/homeassistant/components/hue/light.py", line 412, in async_turn_off
    await self.light.set_state(**command)
  File "/usr/local/lib/python3.7/site-packages/aiohue/lights.py", line 117, in set_state
    json=data)
  File "/usr/local/lib/python3.7/site-packages/aiohue/bridge.py", line 63, in request
    data = await res.json()
  File "/usr/local/lib/python3.7/site-packages/aiohttp/client_reqrep.py", line 1036, in json
    return loads(stripped.decode(encoding))
  File "/usr/local/lib/python3.7/json/__init__.py", line 348, in loads
    return _default_decoder.decode(s)
  File "/usr/local/lib/python3.7/json/decoder.py", line 337, in decode
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())
  File "/usr/local/lib/python3.7/json/decoder.py", line 355, in raw_decode
    raise JSONDecodeError("Expecting value", s, err.value) from None
json.decoder.JSONDecodeError: Expecting value: line 1 column 79 (char 78)

I’m currently running hass.io 0.89.1 on a Raspberry Pi with Python 3.7.2

Do you have any idea how to fix this?