var.set broken in version 0.15.4

[IgorSimic]

Following:
service: var.set
data:
entity_id: var.hass_up
value: "on"

works without any problem in version 0.15.3
but in version 0.15.4 produces error:
Traceback (most recent call last):
File "/srv/hass312/lib/python3.12/site-packages/homeassistant/helpers/script.py", line 501, in _async_step
await getattr(self, handler)()
File "/srv/hass312/lib/python3.12/site-packages/homeassistant/helpers/script.py", line 736, in _async_call_service_step
response_data = await self._async_run_long_action(
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/srv/hass312/lib/python3.12/site-packages/homeassistant/helpers/script.py", line 699, in _async_run_long_action
return await long_task
^^^^^^^^^^^^^^^
File "/srv/hass312/lib/python3.12/site-packages/homeassistant/core.py", line 2738, in async_call
response_data = await coro
^^^^^^^^^^
File "/srv/hass312/lib/python3.12/site-packages/homeassistant/core.py", line 2779, in _execute_service
return await target(service_call)
^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/srv/hass312/lib/python3.12/site-packages/homeassistant/helpers/service.py", line 975, in entity_service_call
single_response = await _handle_entity_call(
^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/srv/hass312/lib/python3.12/site-packages/homeassistant/helpers/service.py", line 1047, in _handle_entity_call
result = await task
^^^^^^^^^^
File "/home/homeassistant/.homeassistant/custom_components/var/init.py", line 447, in async_set
await self.async_write_ha_state()
TypeError: object NoneType can't be used in 'await' expression

[snarky-snark]

Is v0.15.5 any better?

[IgorSimic]

Yes, it works now. Thank you very much.