'there is' anomaly

[Paul Kocsis]

I have a handler in a mainstack card script:

on trydelete2 pgrp
  if there is a group pgrp then
    delete group pgrp
  end if
end trydelete2

Once in a great while, my standalone will error with the following error
text:

Executing at 1:01:03 AM on Wednesday, August 16, 2006
Type: delete: can't find object
Object: card "card id 1002" of stack "C:/MultiMediaApp/MultiMediaApp.exe"
Line: if there is a group pgrp then
Line Num: 0
Hint: trydelete2

Obviously, my handler is written to not attempt to delete a group if the
'there is' fails....so how is it conceivable that I could get this execution
error????

Any ideas??

Paul Kocsis