Check this FAQ How can I release all open forms FAQ #7975 - you don't want to perform the check you're doing.

_screen.Forms is a collection of individual forms.

>I'm having a minor issue with the following routine to close any open windows when my application does an auto shutdown due in inactivity. I'm not sure why this is, but I keep gettings FORMS is not an object in my error log. The application does close any open dialogs, but with 50 users, the log is getting filled up with this error message.
>
>Thanks for any help.
>
>

>local lnForms, i
>lnForms = _screen.formcount
>SET MESSAGE TO [Closing Dialogs...]
>IF lnForms > 0
>	FOR i = lnForms to 1 STEP -1
>		IF VARTYPE(_screen.Forms)=[O]                                                      << FORMS is not an object
>			SET MESSAGE TO [Closing Dialog: ]+_screen.Forms(i).Name    << FORMS is not an object
>			_screen.Forms(i).Release                                                          << FORMS is not an object
>		ENDIF 
>	ENDFOR
>ENDIF 
>