Thanks Andykn101,
At some customers the issue was gone after a reboot but at some others the issue is still there...
The only workaround I´ve found so far is to temporary disabling the collection of the "Patch Windows" data.(until a fix is provided)
1. On the Inventory policies click on "Advanced".
2. On the "Data Classes" tab expand "Inventory data classes > Software > Windows".
3. Clear the check mark from "Patch Windows".
4. Click "OK" and save the changes.
Network23