Steps to reproduce:
1. Right click a smart playlist
2. Choose 'Edit Smart Playlist'
3. Crash


Stack trace:
Exception in Gtk# callback delegate
  Note: Applications can use GLib.ExceptionManager.UnhandledException to handle the exception.
System.IndexOutOfRangeException: Array index is out of range.
  at Banshee.SmartPlaylist.QueryMatch.get_Filter () [0x00000] 
  at Banshee.SmartPlaylist.QueryMatchInteger.get_DisplayWidget () [0x00000] 
  at Banshee.SmartPlaylist.QueryBuilderMatchRow.OnOpComboBoxChanged (System.Object o, System.EventArgs args) [0x00000] 
  at (wrapper delegate-invoke) System.MulticastDelegate:invoke_void_object_EventArgs (object,System.EventArgs)
  at GLib.Signal.voidObjectCallback (IntPtr handle, IntPtr gch) [0x00000] 

   at GLib.ExceptionManager.RaiseUnhandledException ()
   at GLib.Signal.voidObjectCallback ()
   at GLib.Signal.voidObjectCallback ()
   at Gtk.ComboBox.gtk_combo_box_remove_text ()
   at Gtk.ComboBox.gtk_combo_box_remove_text ()
   at Gtk.ComboBox.RemoveText ()
   at Banshee.SmartPlaylist.QueryBuilderMatchRow.Select ()
   at Banshee.SmartPlaylist.QueryBuilderMatchRow.OnFieldComboBoxChanged ()
   at System.MulticastDelegate.invoke_void_object_EventArgs ()
   at GLib.Signal.voidObjectCallback ()
   at GLib.Signal.voidObjectCallback ()
   at Gtk.ComboBox.gtk_combo_box_set_active_iter ()
   at Gtk.ComboBox.gtk_combo_box_set_active_iter ()
   at Gtk.ComboBox.SetActiveIter ()
   at Banshee.SmartPlaylist.ComboBoxUtil.SetActiveString ()
   at Banshee.SmartPlaylist.QueryBuilder.set_MatchQuery ()
   at Banshee.SmartPlaylist.Editor.set_Condition ()
   at Banshee.SmartPlaylist.Editor..ctor ()
   at Banshee.SmartPlaylist.SmartPlaylistSource.ShowPropertiesDialog ()
   at Banshee.PlayerUI.OnSelectedSourcePropertiesAction ()
   at System.MulticastDelegate.invoke_void_object_EventArgs ()
   at GLib.Signal.voidObjectCallback ()
   at GLib.Signal.voidObjectCallback ()
   at Gtk.Application.gtk_main ()
   at Gtk.Application.gtk_main ()
   at Gtk.Application.Run ()
   at Gnome.Program.Run ()
   at Banshee.BansheeEntry.Startup ()
   at System.MulticastDelegate.invoke_void_string[] ()
   at Banshee.Gui.CleanRoomStartup.Startup ()
   at Banshee.BansheeEntry.Main ()
Segmentation fault (core dumped)


Other information:
The list is a "Most Played".  I can't see the actual formula for it (because it crashes when I try to edit it), but it's something like "Choose Play Count > 0, limit to 25".