This entity is no longer being provided by the template integration

Configuration
1

Today after installing the 2025.2.4 update, one of my template sensors no longer works and I cannot figure out why.

The only hint I have is this message when I try to view the sensor:

This entity is no longer being provided by the template integration. If the entity is no longer in use, delete it in settings.

Here is the template, which was working before the update:

template:     
  - trigger:
      - platform: homeassistant
        event: start
      - platform: state
        entity_id: weather.home
    action:
      - action: weather.get_forecasts
        data:
          type: daily
        target:
          entity_id: weather.home
        response_variable: daily
    sensor:
      - name: Today's Forecast Temperature
        unique_id: temperature_forecast_today
        state: "{{ daily['weather.home'].forecast[0].temperature }}"
        unit_of_measurement: "°F"

Found this error in the log:


Error adding entity sensor.today_s_forecast_temperature for domain sensor with platform template
Traceback (most recent call last):
  File "/usr/src/homeassistant/homeassistant/components/sensor/__init__.py", line 640, in state
    numerical_value = float(value)  # type:ignore[arg-type]
ValueError: could not convert string to float: 'None'

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/usr/src/homeassistant/homeassistant/helpers/entity_platform.py", line 609, in _async_add_entities
    await coro
  File "/usr/src/homeassistant/homeassistant/helpers/entity_platform.py", line 928, in _async_add_entity
    await entity.add_to_platform_finish()
  File "/usr/src/homeassistant/homeassistant/helpers/entity.py", line 1384, in add_to_platform_finish
    self.async_write_ha_state()
    ~~~~~~~~~~~~~~~~~~~~~~~~~^^
  File "/usr/src/homeassistant/homeassistant/helpers/entity.py", line 1023, in async_write_ha_state
    self._async_write_ha_state()
    ~~~~~~~~~~~~~~~~~~~~~~~~~~^^
  File "/usr/src/homeassistant/homeassistant/helpers/entity.py", line 1148, in _async_write_ha_state
    self.__async_calculate_state()
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^
  File "/usr/src/homeassistant/homeassistant/helpers/entity.py", line 1085, in __async_calculate_state
    state = self._stringify_state(available)
  File "/usr/src/homeassistant/homeassistant/helpers/entity.py", line 1029, in _stringify_state
    if (state := self.state) is None:
                 ^^^^^^^^^^
  File "/usr/src/homeassistant/homeassistant/components/sensor/__init__.py", line 642, in state
    raise ValueError(
    ...<5 lines>...
    ) from err
ValueError: Sensor sensor.today_s_forecast_temperature has device class 'None', state class 'None' unit '°F' and suggested precision 'None' thus indicating it has a numeric value; however, it has the non-numeric value: 'None' (<class 'str'>)
2

The template sensor’s template results in the value "None" but since you specified a unit of measurement it needs to be a number and so it fails.

The question is: why does the template return None? You can go to developer tools → actions, click on YAML mode, and paste the action from your template. Then perform the action and see what response you get.

Here’s what you’d want to paste:

action: weather.get_forecasts
data:
  type: daily
target:
  entity_id: weather.forecast_home
response_variable: daily
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