Cannot insert the value NULL into column 'CounterName', table 'dba_local.dbo.PerformanceCounter'; column does not allow nulls

[lorcz]

I'm getting the following error:
Cannot insert the value NULL into column 'CounterName', table 'dba_local.dbo.PerformanceCounter'; column does not allow nulls. INSERT fails.

This is coming from this store procedure:

EXEC spGetPerfCountersFromPowerShell