Docky suddenly terminate when running quassel

This is error message when i running quassel, i use lubuntu 14.04 32bit , docky version: 2.2.0 , quassel version: 0.10.0 , x version 1.15.1 :
(Docky:3187): Wnck-WARNING **: Unhandled action type _OB_WM_ACTION_UNDECORATE
Exception in Gtk# callback delegate
  Note: Applications can use GLib.ExceptionManager.UnhandledException to handle the exception.
System.Exception: Error 32: Broken pipe
at DBus.Unix.UnixSocket.Write (byte*,int) <0x0007b>
at DBus.Unix.UnixSocket.Write (byte[],int,int) <0x0003f>
at DBus.Unix.UnixStream.Write (byte[],int,int) <0x0001f>
at System.IO.MemoryStream.WriteTo (System.IO.Stream) <0x0003e>
at DBus.Protocol.MessageWriter.ToStream (System.IO.Stream) <0x0001a>
at DBus.Protocol.Header.GetHeaderDataToStream (System.IO.Stream) <0x0005f>
at DBus.Transports.Transport.WriteMessage (DBus.Protocol.Message) <0x0004b>
at DBus.Connection.Send (DBus.Protocol.Message) <0x00050>
at DBus.BusObject.SendSignal (string,string,string,DBus.Protocol.MessageWriter,System.Type,System.Exception&) <0x00182>
at (wrapper dynamic-method) DBus.Protocol.MessageWriter.HandleItemAdded (DBus.BusObject,DBus.ObjectPath) <0x000a7>
at Docky.DBus.DockManagerDBus.OnItemAdded (DBus.ObjectPath) <0x00022>
at Docky.DBus.DBusManager.RegisterItem (Docky.Items.AbstractDockItem) <0x000d7>
at Docky.Interface.DockWindow.RegisterItem (Docky.Items.AbstractDockItem) <0x001e3>
at Docky.Interface.DockWindow.ProviderItemsChanged (object,Docky.Items.ItemsChangedArgs) <0x0005b>
at (wrapper delegate-invoke) System.EventHandler`1<Docky.Items.ItemsChangedArgs>.invoke_void__this___object_TEventArgs (object,Docky.Items.ItemsChangedArgs) <0x0004c>
at Docky.Items.AbstractDockItemProvider.OnItemsChanged (System.Collections.Generic.IEnumerable`1<Docky.Items.AbstractDockItem>,System.Collections.Generic.IEnumerable`1<Docky.Items.AbstractDockItem>) <0x0005a>
at Docky.Items.AbstractDockItemProvider.set_Items (System.Collections.Generic.IEnumerable`1<Docky.Items.AbstractDockItem>) <0x00493>
at Docky.Items.FileApplicationProvider.RemoveTransientItems (System.Collections.Generic.IEnumerable`1<Docky.Items.WnckDockItem>) <0x0015b>
at Docky.Items.FileApplicationProvider.UpdateTransientItems () <0x006df>
at Docky.Items.FileApplicationProvider/<WnckScreenDefaultWindowOpened>c__AnonStoreyC.<>m__1F () <0x00073>
at GLib.Timeout/TimeoutProxy.Handler () <0x00030>

   at GLib.ExceptionManager.RaiseUnhandledException(System.Exception e, Boolean is_terminal)
   at GLib.Timeout+TimeoutProxy.Handler()
   at Gtk.Application.gtk_main()
   at Gtk.Application.Run()
   at Docky.Docky.Main(System.String[] args)
[Fatal 07:59:54.223] [GLib] Source ID 225 was not found when attempting to remove it
[Fatal 07:59:54.223] [GLib] Source ID 227 was not found when attempting to remove it
[Fatal 07:59:54.223] [GLib] Source ID 261 was not found when attempting to remove it
[Fatal 07:59:54.223] [GLib] Source ID 229 was not found when attempting to remove it
[Fatal 07:59:54.223] [GLib] Source ID 81 was not found when attempting to remove it
[Fatal 07:59:54.224] [GLib] Source ID 85 was not found when attempting to remove it
[Fatal 07:59:54.224] [GLib] Source ID 42 was not found when attempting to remove it
[Fatal 07:59:54.224] [GLib] Source ID 117 was not found when attempting to remove it
[Fatal 07:59:54.224] [GLib] Source ID 51 was not found when attempting to remove it
[Fatal 07:59:54.224] [GLib] Source ID 55 was not found when attempting to remove it
[Fatal 07:59:54.224] [GLib] Source ID 47 was not found when attempting to remove it
[Fatal 07:59:54.224] [GLib] Source ID 78 was not found when attempting to remove it
[Fatal 07:59:54.224] [GLib] Source ID 43 was not found when attempting to remove it
[Fatal 07:59:54.224] [GLib] Source ID 38 was not found when attempting to remove it
[Fatal 07:59:54.224] [GLib] Source ID 13 was not found when attempting to remove it
[Fatal 07:59:54.224] [GLib] Source ID 54 was not found when attempting to remove it
[Fatal 07:59:54.224] [GLib] Source ID 76 was not found when attempting to remove it
[Fatal 07:59:54.224] [GLib] Source ID 40 was not found when attempting to remove it
[Fatal 07:59:54.224] [GLib] Source ID 44 was not found when attempting to remove it
[Fatal 07:59:54.224] [GLib] Source ID 36 was not found when attempting to remove it
[Fatal 07:59:54.224] [GLib] Source ID 45 was not found when attempting to remove it
[Fatal 07:59:54.224] [GLib] Source ID 149 was not found when attempting to remove it
[Fatal 07:59:54.224] [GLib] Source ID 24 was not found when attempting to remove it
[Fatal 07:59:54.225] [GLib] Source ID 57 was not found when attempting to remove it
[Fatal 07:59:54.225] [GLib] Source ID 75 was not found when attempting to remove it
[Fatal 07:59:54.225] [GLib] Source ID 46 was not found when attempting to remove it
[Fatal 07:59:54.225] [GLib] Source ID 50 was not found when attempting to remove it
[Fatal 07:59:54.225] [GLib] Source ID 37 was not found when attempting to remove it
[Fatal 07:59:54.225] [GLib] Source ID 48 was not found when attempting to remove it
[Fatal 07:59:54.225] [GLib] Source ID 49 was not found when attempting to remove it
[Fatal 07:59:54.225] [GLib] Source ID 41 was not found when attempting to remove it