TypeError: unsupported operand type(s) for +: 'float' and 'NoneType'

[Wiigian]

Logger: homeassistant
Source: custom_components/tibber_data/sensor.py:249
Integration: Tibber data (documentation, issues)
First occurred: August 15, 2023 at 13:24:29 (11217 occurrences)
Last logged: 09:21:29
Error doing job: Task exception was never retrieved

Traceback (most recent call last):
File "/usr/src/homeassistant/homeassistant/helpers/update_coordinator.py", line 229, in _handle_refresh_interval
await self._async_refresh(log_failures=True, scheduled=True)
File "/usr/src/homeassistant/homeassistant/helpers/update_coordinator.py", line 374, in _async_refresh
self.async_update_listeners()
File "/usr/src/homeassistant/homeassistant/helpers/update_coordinator.py", line 164, in async_update_listeners
update_callback()
File "/config/custom_components/tibber_data/sensor.py", line 112, in _handle_coordinator_update
native_value = self.update_energy_total_price_with_subsidy_sensor()
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/config/custom_components/tibber_data/sensor.py", line 249, in update_energy_total_price_with_subsidy_sensor
return grid_price + price - self.coordinator.data["est_subsidy"]
~~~~~~~~~~~^~~~~~~
TypeError: unsupported operand type(s) for +: 'float' and 'NoneType'