Error: Could not find robot_serial for specified vendor_name

[genfersee]

Dear all,

Whereas I am using plugin 0.4.0 and have it working ok with MyKoboldApp, I always get the error message:

[26.06.2022, 15:30:23] [VorwerkVacuumRobot] Could not find robot_serial for specified vendor_name: [object Object] [26.06.2022, 15:30:23] [VorwerkVacuumRobot] Could not find robot_serial for specified vendor_name: [object Object] [26.06.2022, 15:30:23] [VorwerkVacuumRobot] Could not find robot_serial for specified vendor_name: [object Object] [26.06.2022, 15:30:23] [homebridge-vorwerk] This plugin generated a warning from the characteristic 'Battery Level': characteristic was supplied illegal value: null! Home App will reject null for Apple defined characteristics. See https://homebridge.io/w/JtMGR for more info.

I also retried the registering process and result is the same. These logs are always coming.

Do you know why?