>>>>>A project with some automation generates charts. In cases were the values are zero, the
>>>VFP ON ERROR reports an unknown name (800200006) error on "nHwnd = oEx.Hwnd"
>>
>>What version of Excel? Hwnd is on Excel2002. I don't have any other version of Excel installed that I can check.
>
>Excel 2000 doesn't have such property.

Thanks Sergey. I'll keep that in mind for future reference.