Opening and closing preference window make docky crash

If I open the preference window (from the anchor icon) and then close it, docky crashes.

ivan@bigwave ~/ $ docky -d

** (/usr/lib/docky/Docky.exe:16901): WARNING **: Symbol file /usr/lib/mono/gac/NDesk.DBus/1.0.0.0__f6716e4f9b2ed099/NDesk.DBus.dll.mdb has incorrect version (expected 50.0, got 39)
[Info 16:20:55.789] Docky version: bzr trunk r1092
[Info 16:20:55.796] Kernel version: 2.6.32.0
[Info 16:20:55.797] CLR version: 2.0.50727.1433
[Warn 16:20:55.930] [GLib] g_set_prgname() called multiple times
[Info 16:20:55.948] [Gtk] Failed to load module "gnomenu-panel": libgnomenu-panel.so: cannot open shared object file: No such file or directory
[Info 16:20:56.112] [DockServices] Dock services initialized.
[Info 16:20:56.248] [DockController] Setting theme: Black Glass
[Info 16:20:56.677] [PluginManager] Loaded "Docky.Widgets,1.0".
[Info 16:20:56.677] [PluginManager] Loaded "Docky.Widgets,1.0".
[Info 16:20:56.678] [PluginManager] Loaded "GMail".

** (/usr/lib/docky/Docky.exe:16901): WARNING **: Symbol file /usr/lib/mono/gac/Gnome.Keyring/1.0.0.0__1a73e1bde00c9b66/Gnome.Keyring.dll.mdb has incorrect version (expected 50.0, got 39)
[Info 16:20:57.208] [GMailAtom] Fetching Atom feed: https://mail.google.com/mail/feed/atom/Inbox
[Info 16:20:58.059] [Helper] Starting rhythmbox_control.py
[Info 16:20:58.112] [DrawingService] Could not find 'banshee', using fallback of 'extension'.
##my comment: OPENED PREFERENCE WINDOW
##my comment: CLOSED PREFERENCE WINDOW
Exception in Gtk# callback delegate
  Note: Applications can use GLib.ExceptionManager.UnhandledException to handle the exception.
System.NullReferenceException: Object reference not set to an instance of an object
  at Docky.Interface.AutohideManager.HandleCursorPositionChanged (System.Object sender, Docky.Interface.CursorPostionChangedArgs args) [0x00000] in /tmp/yaourt-tmp-root/aur-docky-bzr/docky-bzr/src/docky/Docky/Docky/Interface/AutohideManager.cs:120
  at (wrapper delegate-invoke) System.EventHandler`1<Docky.Interface.CursorPostionChangedArgs>:invoke_void__this___object_CursorPostionChangedArgs (object,Docky.Interface.CursorPostionChangedArgs)
  at Docky.Interface.CursorTracker.OnCursorPositionChanged (Point oldPoint) [0x0001a] in /tmp/yaourt-tmp-root/aur-docky-bzr/docky-bzr/src/docky/Docky/Docky/Interface/CursorTracker.cs:162
  at Docky.Interface.CursorTracker.Update (Gdk.Screen screen, Int32 x, Int32 y, ModifierType mod) [0x0004b] in /tmp/yaourt-tmp-root/aur-docky-bzr/docky-bzr/src/docky/Docky/Docky/Interface/CursorTracker.cs:152
  at Docky.Interface.CursorTracker.SendManualUpdate (Gdk.EventCrossing evnt) [0x0005a] in /tmp/yaourt-tmp-root/aur-docky-bzr/docky-bzr/src/docky/Docky/Docky/Interface/CursorTracker.cs:98
  at Docky.Interface.DockWindow.OnEnterNotifyEvent (Gdk.EventCrossing evnt) [0x0000b] in /tmp/yaourt-tmp-root/aur-docky-bzr/docky-bzr/src/docky/Docky/Docky/Interface/DockWindow.cs:1064
  at Gtk.Widget.enternotifyevent_cb (IntPtr widget, IntPtr evnt) [0x00000] in <filename unknown>:0
   at GLib.ExceptionManager.RaiseUnhandledException(System.Exception e, Boolean is_terminal)
   at Gtk.Widget.enternotifyevent_cb(IntPtr widget, IntPtr evnt)
   at Gtk.Application.gtk_main()
   at Gtk.Application.Run()
   at Docky.Docky.Main(System.String[] args) in /tmp/yaourt-tmp-root/aur-docky-bzr/docky-bzr/src/docky/Docky/Docky/Docky.cs:line 95
Cairo.Context: called from finalization thread, programmer is missing a call to Dispose
ivan@bigwave ~/ $

I wrote these (##my comment: ...) to show when i opened the window.