bad logger message

[Tazmanian79]

The last week (after my Toon was updated to the latest version) I see the following error in my HA logs:

Logger: homeassistant.helpers.event
Bron: helpers/event.py:352
Eerst voorgekomen: 12:50:52 (22 gebeurtenissen)
Laatst gelogd: 12:53:02

Bad logger message: Sensor sensor.toon_p1_power_prod_cnt_high_compensation_2 has device class 'monetary', state class 'total' unit 'EUR' and suggested precision 'None' thus indicating it has a numeric value; however, it has the non-finite value: 'nan'
Bad logger message: Sensor sensor.toon_p1_waterquantity_cost_2 has device class 'monetary', state class 'total' unit 'EUR' and suggested precision 'None' thus indicating it has a numeric value; however, it has the non-finite value: 'nan'
Bad logger message: Sensor sensor.toon_gas_used_cnt_cost_2 has device class 'monetary', state class 'total' unit 'EUR' and suggested precision 'None' thus indicating it has a numeric value; however, it has the non-finite value: 'nan'

[cyberjunky]

Same as #76 I think it has to do with an invalid NaN value from my integration, and then the added cost sensor cannot calculate and throws an error. Have to see how other integration handle this.