Hi ben.polzin,
Looks like you're right, on an ESX(i) host, the instanceUuid is not applicable as that's a vCenter attribute and hence unset. I'll fix this in a future release
As a interim, you can subsitute $sc->about->instanceUuid with (defined($sc->about->instanceUuid) ? $sc->about->instanceUuid : "N/A")
Thanks
