Grohe Ondus HANDLER_INITIALIZING_ERROR for Guard device

I installed the binding, account goes ONLINE
The scan brings up the Guard + 3 sensors
The sensors go online, but the Guard thing reports

HANDLER_INITIALIZING_ERROR
Cannot invoke "java.lang.Integer.intValue()" because the return value of "io.github.floriansw.ondus.api.model.guard.Config.getMeasurementTransmissionIntervall()" is null

Is there a fix? Anything else I could change?