Crash deleting futures from IM

[Pete S]

1. Start NT beta 4
2. Open Instrument Manager
3. Select Type = Future, press Search
4. Select first item, delete
5. Select second item, delete

Get "NinjaTrader needs to shut down" message, this stack trace in trace file:

2007-12-05 07:27:08:890 in OnUnhandledThreadException
2007-12-05 07:27:09:062 ********* exception trapped *********
2007-12-05 07:27:09:062 at Wilson.ORMapper.Internals.Context.get_Item(Object entityObject)
at Wilson.ORMapper.ObjectSpace.MarkForDeletion(Object entityObject)
at NinjaTrader.Gui.InstrumentManager.btnDelete_Click( Object sender, EventArgs e)
at System.Windows.Forms.Control.OnClick(EventArgs e)
at System.Windows.Forms.Button.OnClick(EventArgs e)
at System.Windows.Forms.Button.OnMouseUp(MouseEventAr gs mevent)
at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
at System.Windows.Forms.Control.WndProc(Message& m)
at System.Windows.Forms.ButtonBase.WndProc(Message& m)
at System.Windows.Forms.Button.WndProc(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.O nMessage(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.W ndProc(Message& m)
at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

[NinjaTrader_Dierk]

This bug will be fixed with next beta. Thanks for reporting.