Can't call method "product" on an undefined value

Hello.

I get that error when I run the script against my vCenter Server 4.1.0 Build 258902. I've tried with the three "check levels", and I get always the same error: Can't call method "product" on an undefined value at ./vmwarevSphereSecurityHardeningReportCheck.pl line 20.

However, if I run the script against my ESXi 4.1 hosts, it works.

I'm working with a vMA 4.1. Any idea?

Thank you very much.