Trouble Closing My Application

I'm having trouble closing database app.  It occurs only after I click a
node 
in a treeview control then try closing the app.  I get "Microsoft Office 
Access has encountered a problem and needs to close.  We are sorry for the

inconvenience.".  Here is the code:  (only started do this when we
upgraded 
to 2007).


Private Sub tvwReviewers_NodeClick(ByVal node As Object)
On Error GoTo ErrorHandler
   Dim frm1 As Access.Form
   Set frm1 = Me![frmItemsDetail].Form
   Me!SelectedReviewItem = Null
   If Left(node.Key, 6) = "level2" Then
      Me![SelectedReviewItem].Value = Mid(node.Key, 7)
      frm1.RecordSource = "qrySelectedItem"
      frm1.Visible = True
      ListView0.Visible = True
      FillListView
   Me.StorageBtn.Enabled = True
   Me.HistoryBtn.Enabled = True
   Me.DetailBtn.Enabled = True
   Me.ReminderABtn.Enabled = True
   Me.ReminderBtn.Enabled = True


   Else
   frm1.Visible = False
   Me!SelectedReviewItem = Null
   ListView0.ListItems.Clear
   ListView0.Visible = False
   Me.StorageBtn.Enabled = False
   Me.HistoryBtn.Enabled = False
   Me.DetailBtn.Enabled = False
   Me.ReminderABtn.Enabled = False
   Me.ReminderBtn.Enabled = False

   
   End If
ErrorHandlerExit:
   Exit Sub

ErrorHandler:
   MsgBox "Error No: " & Err.Number & "; Description: " & Err.Description
   Resume ErrorHandlerExit
Set frm1 = Nothing

End Sub