Missing currency in recorder?

[kodsama]

Hi!

I get this error in HA with the recorder:

[homeassistant.components.sensor.recorder] The unit of sensor.greenely_hourly_usage (None) cannot be converted to the unit of previously compiled statistics (kWh). Generation of long term statistics will be suppressed unless the unit changes back to kWh or a compatible unit. Go to https://my.home-assistant.io/redirect/developer_statistics to fix this

It seems we need to provide a currency when getting the price to be able to store it.