Unhandled exception has ocurred in your application.

If I PGDN, PGUP and then try to search for something I get this error.  Quite often.

1.4.6.2

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See the end of this message for details on invoking
just-in-time (JIT) debugging instead of this dialog box.

************** Exception Text **************
System.NullReferenceException: Object reference not set to an instance of an object.
   at CustomsForgeSongManager.UControls.SongManager.dgvSongsMaster_Sorted(Object sender, EventArgs e)
   at System.Windows.Forms.DataGridView.OnSorted(EventArgs e)
   at System.Windows.Forms.DataGridView.SortInternal(IComparer comparer, DataGridViewColumn dataGridViewColumn, ListSortDirection direction)
   at System.Windows.Forms.DataGridView.Sort(DataGridViewColumn dataGridViewColumn, ListSortDirection direction)
   at DataGridViewTools.DgvExtensions.RestoreSorting(DataGridView grid, Boolean toggleSort)
   at CustomsForgeSongManager.UControls.SongManager.cueSearch_KeyUp(Object sender, KeyEventArgs e)
   at System.Windows.Forms.Control.OnKeyUp(KeyEventArgs e)
   at System.Windows.Forms.Control.ProcessKeyEventArgs(Message& m)
   at System.Windows.Forms.Control.ProcessKeyMessage(Message& m)
   at System.Windows.Forms.Control.WmKeyChar(Message& m)
   at System.Windows.Forms.Control.WndProc(Message& m)
   at System.Windows.Forms.TextBoxBase.WndProc(Message& m)
   at System.Windows.Forms.TextBox.WndProc(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
   at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
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