2020-10-16 10:53:52 ERROR (MainThread) [homeassistant.components.sensor] gismeteo: Error on device update!
Traceback (most recent call last):
  File "/usr/src/homeassistant/homeassistant/helpers/entity_platform.py", line 346, in _async_add_entity
    await entity.async_device_update(warning=False)
  File "/usr/src/homeassistant/homeassistant/helpers/entity.py", line 471, in async_device_update
    await self.hass.async_add_executor_job(self.update)  # type: ignore
  File "/usr/local/lib/python3.8/concurrent/futures/thread.py", line 57, in run
    result = self.fn(*self.args, **self.kwargs)
  File "/config/custom_components/gismeteo/sensor.py", line 126, in update
    self._wd.update()
  File "/usr/src/homeassistant/homeassistant/util/__init__.py", line 239, in wrapper
    result = method(*args, **kwargs)
  File "/config/custom_components/gismeteo/__init__.py", line 352, in update
    ATTR_WEATHER_PRECIPITATION_AMOUNT: self._get(current_v, "prflt", float),
  File "/config/custom_components/gismeteo/__init__.py", line 153, in _get                                                                                                  
    res = func(res)
TypeError: float() argument must be a string or a number, not 'NoneType'

This is not a component error - unfortunately, this is an error on the Gismeteo server. I don't know when they fix it. Therefore, I added a check to the component for the correctness of the data returned from the server. All invalid data is now simply ignored.