Warnings during homebridge startup: characteristic was supplied illegal value: undefined!

[roboterm]

[21/12/2020, 13:05:31] Received warning for the plugin 'homebridge-airrohr' from the characteristic 'Current Temperature': characteristic was supplied illegal value: undefined! This might throw errors in the future!
[Current Temperature@Homebridge CAD8] characteristic was supplied illegal value: undefined! This might throw errors in the future!
[21/12/2020, 13:05:31] Received warning for the plugin 'homebridge-airrohr' from the characteristic 'Current Relative Humidity': characteristic was supplied illegal value: undefined! This might throw errors in the future!
[Current Relative Humidity@Homebridge CAD8] characteristic was supplied illegal value: undefined! This might throw errors in the future!
[21/12/2020, 13:05:31] Received warning for the plugin 'homebridge-airrohr' from the characteristic 'Air Quality': characteristic was supplied illegal value: undefined! This might throw errors in the future!
[Air Quality@Homebridge CAD8] characteristic was supplied illegal value: undefined! This might throw errors in the future!
[21/12/2020, 13:05:31] Received warning for the plugin 'homebridge-airrohr' from the characteristic 'PM2.5 Density': characteristic was supplied illegal value: undefined! This might throw errors in the future!
[PM2.5 Density@Homebridge CAD8] characteristic was supplied illegal value: undefined! This might throw errors in the future!
[21/12/2020, 13:05:31] Received warning for the plugin 'homebridge-airrohr' from the characteristic 'PM10 Density': characteristic was supplied illegal value: undefined! This might throw errors in the future!
[PM10 Density@Homebridge CAD8] characteristic was supplied illegal value: undefined! This might throw errors in the future!

[gielk]

[03/03/2021, 15:26:59] [homebridge-airrohr] This plugin generated a warning from the characteristic 'Air Quality': characteristic value expected number and received undefined. See https://git.io/JtMGR for more info.
[03/03/2021, 15:26:59] [homebridge-airrohr] Error:
at AirQuality.Characteristic.characteristicWarning (/usr/local/lib/node_modules/homebridge/node_modules/hap-nodejs/src/lib/Characteristic.ts:2164:105)
at AirQuality.Characteristic.validateUserInput (/usr/local/lib/node_modules/homebridge/node_modules/hap-nodejs/src/lib/Characteristic.ts:1996:16)
at /usr/local/lib/node_modules/homebridge/node_modules/hap-nodejs/src/lib/Characteristic.ts:1517:24
at /usr/local/lib/node_modules/homebridge/node_modules/hap-nodejs/src/lib/util/once.ts:9:18
at AirQuality. (/usr/local/lib/node_modules/homebridge-airrohr/index.js:185:32)
at AirQuality.emit (events.js:315:20)
at /usr/local/lib/node_modules/homebridge/node_modules/hap-nodejs/src/lib/Characteristic.ts:1493:14
at new Promise ()
at AirQuality. (/usr/local/lib/node_modules/homebridge/node_modules/hap-nodejs/src/lib/Characteristic.ts:1491:12)
at step (/usr/local/lib/node_modules/homebridge/node_modules/tslib/tslib.js:143:27)
at Object.next (/usr/local/lib/node_modules/homebridge/node_modules/tslib/tslib.js:124:57)
at /usr/local/lib/node_modules/homebridge/node_modules/tslib/tslib.js:117:75
at new Promise ()
at Object.__awaiter (/usr/local/lib/node_modules/homebridge/node_modules/tslib/tslib.js:113:16)
at AirQuality.Characteristic.handleGetRequest (/usr/local/lib/node_modules/homebridge/node_modules/hap-nodejs/dist/lib/Characteristic.js:648:24)
at Bridge. (/usr/local/lib/node_modules/homebridge/node_modules/hap-nodejs/src/lib/Accessory.ts:1507:27)
at step (/usr/local/lib/node_modules/homebridge/node_modules/tslib/tslib.js:143:27)
at Object.next (/usr/local/lib/node_modules/homebridge/node_modules/tslib/tslib.js:124:57)
at /usr/local/lib/node_modules/homebridge/node_modules/tslib/tslib.js:117:75
at new Promise ()
at Object.__awaiter (/usr/local/lib/node_modules/homebridge/node_modules/tslib/tslib.js:113:16)
at Bridge.Accessory.handleCharacteristicRead (/usr/local/lib/node_modules/homebridge/node_modules/hap-nodejs/dist/lib/Accessory.js:1273:24)
[03/03/2021, 15:26:59] [homebridge-airrohr] This plugin generated a warning from the characteristic 'PM2.5 Density': characteristic value expected float and received undefined. See https://git.io/JtMGR for more info.
[03/03/2021, 15:26:59] [homebridge-airrohr] Error:
at PM2_5Density.Characteristic.characteristicWarning (/usr/local/lib/node_modules/homebridge/node_modules/hap-nodejs/src/lib/Characteristic.ts:2164:105)
at PM2_5Density.Characteristic.validateUserInput (/usr/local/lib/node_modules/homebridge/node_modules/hap-nodejs/src/lib/Characteristic.ts:1970:16)
at /usr/local/lib/node_modules/homebridge/node_modules/hap-nodejs/src/lib/Characteristic.ts:1517:24
at /usr/local/lib/node_modules/homebridge/node_modules/hap-nodejs/src/lib/util/once.ts:9:18
at PM2_5Density. (/usr/local/lib/node_modules/homebridge-airrohr/index.js:188:32)
at PM2_5Density.emit (events.js:315:20)
at /usr/local/lib/node_modules/homebridge/node_modules/hap-nodejs/src/lib/Characteristic.ts:1493:14
at new Promise ()
at PM2_5Density. (/usr/local/lib/node_modules/homebridge/node_modules/hap-nodejs/src/lib/Characteristic.ts:1491:12)
at step (/usr/local/lib/node_modules/homebridge/node_modules/tslib/tslib.js:143:27)
at Object.next (/usr/local/lib/node_modules/homebridge/node_modules/tslib/tslib.js:124:57)
at /usr/local/lib/node_modules/homebridge/node_modules/tslib/tslib.js:117:75
at new Promise ()
at Object.__awaiter (/usr/local/lib/node_modules/homebridge/node_modules/tslib/tslib.js:113:16)
at PM2_5Density.Characteristic.handleGetRequest (/usr/local/lib/node_modules/homebridge/node_modules/hap-nodejs/dist/lib/Characteristic.js:648:24)
at Bridge. (/usr/local/lib/node_modules/homebridge/node_modules/hap-nodejs/src/lib/Accessory.ts:1507:27)
at step (/usr/local/lib/node_modules/homebridge/node_modules/tslib/tslib.js:143:27)
at Object.next (/usr/local/lib/node_modules/homebridge/node_modules/tslib/tslib.js:124:57)
at /usr/local/lib/node_modules/homebridge/node_modules/tslib/tslib.js:117:75
at new Promise ()
at Object.__awaiter (/usr/local/lib/node_modules/homebridge/node_modules/tslib/tslib.js:113:16)
at Bridge.Accessory.handleCharacteristicRead (/usr/local/lib/node_modules/homebridge/node_modules/hap-nodejs/dist/lib/Accessory.js:1273:24)
[03/03/2021, 15:26:59] [homebridge-airrohr] This plugin generated a warning from the characteristic 'PM10 Density': characteristic value expected float and received undefined. See https://git.io/JtMGR for more info.
[03/03/2021, 15:26:59] [homebridge-airrohr] Error:
at PM10Density.Characteristic.characteristicWarning (/usr/local/lib/node_modules/homebridge/node_modules/hap-nodejs/src/lib/Characteristic.ts:2164:105)
at PM10Density.Characteristic.validateUserInput (/usr/local/lib/node_modules/homebridge/node_modules/hap-nodejs/src/lib/Characteristic.ts:1970:16)
at /usr/local/lib/node_modules/homebridge/node_modules/hap-nodejs/src/lib/Characteristic.ts:1517:24
at /usr/local/lib/node_modules/homebridge/node_modules/hap-nodejs/src/lib/util/once.ts:9:18
at PM10Density. (/usr/local/lib/node_modules/homebridge-airrohr/index.js:191:32)
at PM10Density.emit (events.js:315:20)
at /usr/local/lib/node_modules/homebridge/node_modules/hap-nodejs/src/lib/Characteristic.ts:1493:14
at new Promise ()
at PM10Density. (/usr/local/lib/node_modules/homebridge/node_modules/hap-nodejs/src/lib/Characteristic.ts:1491:12)
at step (/usr/local/lib/node_modules/homebridge/node_modules/tslib/tslib.js:143:27)
at Object.next (/usr/local/lib/node_modules/homebridge/node_modules/tslib/tslib.js:124:57)
at /usr/local/lib/node_modules/homebridge/node_modules/tslib/tslib.js:117:75
at new Promise ()
at Object.__awaiter (/usr/local/lib/node_modules/homebridge/node_modules/tslib/tslib.js:113:16)
at PM10Density.Characteristic.handleGetRequest (/usr/local/lib/node_modules/homebridge/node_modules/hap-nodejs/dist/lib/Characteristic.js:648:24)
at Bridge. (/usr/local/lib/node_modules/homebridge/node_modules/hap-nodejs/src/lib/Accessory.ts:1507:27)
at step (/usr/local/lib/node_modules/homebridge/node_modules/tslib/tslib.js:143:27)
at Object.next (/usr/local/lib/node_modules/homebridge/node_modules/tslib/tslib.js:124:57)
at /usr/local/lib/node_modules/homebridge/node_modules/tslib/tslib.js:117:75
at new Promise ()
at Object.__awaiter (/usr/local/lib/node_modules/homebridge/node_modules/tslib/tslib.js:113:16)
at Bridge.Accessory.handleCharacteristicRead (/usr/local/lib/node_modules/homebridge/node_modules/hap-nodejs/dist/lib/Accessory.js:1273:24)