When I run KB89619_Verify_Unsigned_VIBs_on_ESXi_(ver_1.2) in the CLI I get and error.

[dnaeher]

When I run KB89619_Verify_Unsigned_VIBs_on_ESXi_(ver_1.2) in the CLI, the script seems to run, but in the results file I am getting the following error.  "You cannot call a method on a null-valued expression."

[LucD]

Can you provide the full error message, including the line number?

[dnaeher]

I see no errors when I run the command, seems to run find, but when I look at the results I am not seeing what I should.

HostName	OverallStatus	Found_Unsigned_VIBs	HostConnectionState	VIB_ID	VIB_AcceptanceLevel	VIB_SignatureVerification	ERRORs	VIB_Name	VIB_Vendor
MY IP	Skipped	Skipped	Connected	NA	NA	NA	You cannot call a method on a null-valued expression.	NA	NA

[LucD]

You are not seeing PS errors because the script uses a Try-Catch, which intercepts terminating exceptions.
It does look like the Get-EsxCli doesn't return an object, hence the "You cannot call ..." entry in the table.

I assume that ESXi node is connected in the vCenter?
Because the script only looks at connected ESXi nodes.