Dr. Watson error when clicking on a scroll bar in a subform from main

[MikeDNova]

Hey everybody.

I have 3 forms that all work the same. There is a mainform and a subform which are not linked. There are a couple combo boxes on the mainform that act to filter the subform. On the subform there is a list of records. When the focus is on the main form, and the user clicks on the vertical scroll bar to scroll down the records, the application crashes with a Doctor Watson error. I get this error in all three forms.

Thanks for any help.

Mike