DataGridView Sort Chg Throwing NullExceptionError

I have the below bit of code that allows a user to see data in a DataGridView. They can click on a single row and open another form with the detail of the selected item. Once the user returns from that form I refresh the original screen with anything that might have been changed from the other screen (or by other users elsewhere in the network).

This works perfectly fine to select items, go look a the detail and change anything you like, then return and refresh the screen with the new updated information, with one notable exception. I get a NullExceptionError whenever the user has changed the default datagridview sort option on the first screens grid screen. Then selects and item and goes to the second screen and comes back to the first screen. And the really strange thing (to me) is that the first record on the return gets added fine, it is the second record it tries to add that is throwing the error.

Other notes: all variables have values (not nulls), the tableSelect is also valid and not equal to nothing.

If sqlConn.State = Data.ConnectionState.Closed Then sqlConn.Open()
Dim r As Data.SqlClient.SqlDataReader = sqlComm.ExecuteReader()
If r.HasRows = True Then

[Code]....