Possibly it happens because form is destroyed before MyPrg is completed. Try to add some code to suspend form destroy execution until MyPrg is completed.

>I have the following code in Destroy event of a form:
>Do MyPrg with thisform
>
>In MyPrg:
>Parameters oForm
>wait window oForm.caption .......
>
>Most of the time this works but the ODD occasion, an error comes up saying oForm is not an object. I cannot repilcate this myself on testing but it has happened a few times out on site !!!!
>
>Is it possible for the Screen to be destroyed by the time the code is run ? or is there any other reason this would not work ?
>
>Regards,
>
>Gerard