Script error

I have this script to turn on lights for 7 mins, but too often i get errors.
The script:

lights_on_7min:
  alias: Luci Studio on 7 Minuti
  sequence:
    - service: light.turn_on
      entity_id: light.philips_3
      data:
        brightness: 255             
    - service: light.xiaomi_miio_set_scene
      entity_id: light.philips_5
      data:
        scene: '1'
    - delay: 00:07:00
    - service: light.turn_off
      entity_id:
        - light.philips_3
        - light.philips_5

It is the error:

Error executing service <ServiceCall script.lights_on_7min (c:482179f83a2c412c84273e2c755a579c)>
Traceback (most recent call last):
  File "/srv/homeassistant/lib/python3.5/site-packages/homeassistant/core.py", line 1177, in _event_to_service_call
    await service_handler.func(service_call)
  File "/srv/homeassistant/lib/python3.5/site-packages/homeassistant/components/script.py", line 118, in service_handler
    if script.is_on:
AttributeError: 'NoneType' object has no attribute 'is_on'

How to avoid ? What’s wrong?

did you found a solution?