What version of LANDesk are you using? This can happen when corrupt inventory scans come in. However, in the current version, we block "Unknown Items" like this unless you allow them in. Previously they would just come in and you could get things like this and you had to clean them out. If you are using one of those versions, take a look here:
If you are using 9.5, then go into your Advanced Inventory Server settings and review the unknown items
I'm using 9.5 SP1.
I have checked off Block Unknown Items, hopefully this will help.
Thank you, Tanner.