I assume you are using this as part of a HII script. If so then there is a newer version out on the droppedpackets website to get around this.
The issue is that the way the inventory scanner behaves has changed and cannot be used as per the script now. If you wished to continue with the old HII method then you need to switch to WMI machine make / model detection as opposed to the inventory scan.
I found this out after much frustration! I hope this helps you out.
I have seen the new HII documentation few minutes later my post. It seems to work now ...
Thanks for your answer.