docky crashes after some time

This is the entire output running docky:

cephinux@cephinux-macbook:~$ docky -d
[Info 20:20:45.737] Docky version: 2.1.0 bzr docky r1230 ppa
[Info 20:20:45.774] Kernel version: 2.6.31.19
[Info 20:20:45.776] CLR version: 2.0.50727.1433
[Warn 20:20:45.973] [GLib] g_set_prgname() called multiple times
/usr/share/themes/Shiki-Brave/gtk-2.0/gtkrc:126: Murrine configuration option "gradients" is no longer supported and will be ignored.
[Debug 20:20:47.355] [UserArgs] BufferTime = 10
[Debug 20:20:47.355] [UserArgs] MaxSize = 2147483647
[Debug 20:20:47.355] [UserArgs] NetbookMode = False
[Debug 20:20:47.357] [UserArgs] NoPollCursor = False
[Info 20:20:47.992] [DockController] Setting theme: Classic
[Info 20:20:49.593] [PluginManager] Loaded "Trash".
[Info 20:20:49.703] [PluginManager] Loaded "Mounter".
[Debug 20:20:49.953] [MountProvider] Adding 40 GB Dateisystem.
[Info 20:20:49.979] [PluginManager] Loaded "Session Manager".
[Debug 20:20:49.983] [SystemManager] Using ConsoleKit.Manager dbus service
[Debug 20:20:49.990] [SystemManager] No power bus available
[Debug 20:20:49.990] [SystemManager] No power bus available
[Info 20:20:50.549] [Helper] Starting transmission_badge.py
[Info 20:20:50.584] [Helper] Starting gtg_menus.py
[Info 20:20:50.595] [Helper] Starting rhythmbox_control.py
[Info 20:20:50.599] [Helper] Starting liferea_badge.py
[Info 20:20:50.605] [Helper] Starting deluge_badge.py
[Info 20:20:51.194] [DrawingService] Could not find 'gajim', using fallback of 'extension'.
[Info 20:20:52.437] [Helper] deluge_badge.py :: No module named deluge.ui.client
[Info 20:20:52.535] [Helper] deluge_badge.py has exited (Code 0).
[Debug 20:20:52.576] Key MountItem_41410016 does not exist, creating.
[Debug 20:32:34.497] [SystemManager] DBus services changed, reconnecting now
[Debug 20:32:34.503] [SystemManager] Using DeviceKit.Power dbus service
[Debug 20:32:34.503] [SystemManager] Using ConsoleKit.Manager dbus service
[Debug 20:32:34.657] [SystemManager] DBus services changed, reconnecting now
[Debug 20:32:34.662] [SystemManager] Using ConsoleKit.Manager dbus service
[Debug 20:32:34.662] [SystemManager] No power bus available
[Debug 20:32:34.662] [SystemManager] No power bus available
[Debug 20:32:34.685] [SystemManager] DBus services changed, reconnecting now
[Debug 20:32:34.704] [SystemManager] DBus services changed, reconnecting now
[Debug 20:32:34.708] [SystemManager] Using ConsoleKit.Manager dbus service
[Debug 20:32:34.708] [SystemManager] No power bus available
[Debug 20:32:34.708] [SystemManager] No power bus available
[Debug 20:32:34.745] [SystemManager] DBus services changed, reconnecting now
[Debug 20:32:34.746] [SystemManager] Using DeviceKit.Power dbus service
[Debug 20:32:34.746] [SystemManager] Using ConsoleKit.Manager dbus service
[Debug 20:32:34.768] [SystemManager] DBus services changed, reconnecting now
[Debug 20:32:34.775] [SystemManager] Using ConsoleKit.Manager dbus service
[Debug 20:32:34.775] [SystemManager] No power bus available
[Debug 20:32:34.775] [SystemManager] No power bus available
[Error 20:32:34.784] [SystemService] Could not initialize needed dbus service: 'Exception has been thrown by the target of an invocation.'
[Info 20:32:34.786] [SystemService] at System.Reflection.MonoMethod.Invoke (System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) [0x00000]
  at System.Reflection.MethodBase.Invoke (System.Object obj, System.Object[] parameters) [0x00000]
  at System.Delegate.DynamicInvokeImpl (System.Object[] args) [0x00000]
  at System.MulticastDelegate.DynamicInvokeImpl (System.Object[] args) [0x00000]
  at System.Delegate.DynamicInvoke (System.Object[] args) [0x00000]
  at NDesk.DBus.Connection.HandleSignal (NDesk.DBus.Message msg) [0x00000]
  at NDesk.DBus.Connection.DispatchSignals () [0x00000]
  at NDesk.DBus.PendingCall.get_Reply () [0x00000]
  at NDesk.DBus.Connection.SendWithReplyAndBlock (NDesk.DBus.Message msg) [0x00000]
  at NDesk.DBus.BusObject.SendMethodCall (System.String iface, System.String member, System.String inSigStr, NDesk.DBus.MessageWriter writer, System.Type retType, System.Exception& exception) [0x00000]
  at org.freedesktop.DBus.IBusProxy.NameHasOwner (System.String name) [0x00000]
  at NDesk.DBus.Bus.NameHasOwner (System.String name) [0x00000]
  at SessionManager.SystemManager.Initialize () [0x00000]
[Debug 20:32:34.787] [SystemManager] No power bus available
[Debug 20:32:34.787] [SystemManager] No power bus available

Unhandled Exception: System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.Exception: org.freedesktop.DBus.Error.NoReply: Message did not receive a reply (timeout by message bus)
  at SessionManager.SystemManager+IDeviceKitPowerProxy.Get (System.String interface, System.String propname) [0x00000]
  at SessionManager.SystemManager.GetBoolean (Properties dbusobj, System.String path, System.String propname) [0x00000]
  at SessionManager.SystemManager.CanSuspend () [0x00000]
  at SessionManager.SessionManagerItem.GenerateSessionItems () [0x00000]
  at SessionManager.SessionManagerItem.HandlePowermanagerCapabilitiesChanged (System.Object sender, System.EventArgs e) [0x00000]
  at SessionManager.SystemManager.HandleCapabilitiesChanged () [0x00000]
  at SessionManager.SystemManager.<SystemManager>m__A (System.String name, System.String old_owner, System.String new_owner) [0x00000]
  at (wrapper managed-to-native) System.Reflection.MonoMethod:InternalInvoke (object,object[],System.Exception&)
  at System.Reflection.MonoMethod.Invoke (System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) [0x00000]
  --- End of inner exception stack trace ---
at System.Reflection.MonoMethod.Invoke (object,System.Reflection.BindingFlags,System.Reflection.Binder,object[],System.Globalization.CultureInfo) <0x0011f>
at System.Reflection.MethodBase.Invoke (object,object[]) <0x0002a>
at System.Delegate.DynamicInvokeImpl (object[]) <0x0017b>
at System.MulticastDelegate.DynamicInvokeImpl (object[]) <0x0003b>
at System.Delegate.DynamicInvoke (object[]) <0x00015>
at NDesk.DBus.Connection.HandleSignal (NDesk.DBus.Message) <0x00337>
at NDesk.DBus.Connection.DispatchSignals () <0x0003f>
at NDesk.DBus.Connection.Iterate () <0x0003b>
at NDesk.DBus.BusG/<Init>c__AnonStorey0.<>m__0 (intptr,NDesk.GLib.IOCondition,intptr) <0x0003b>
at (wrapper native-to-managed) NDesk.DBus.BusG/<Init>c__AnonStorey0.<>m__0 (intptr,NDesk.GLib.IOCondition,intptr) <0x00077>
at (wrapper managed-to-native) Gtk.Application.gtk_main () <0x00052>
at Gtk.Application.Run () <0x0000b>
at Docky.Docky.Main (string[]) <0x00277>

System: Ubuntu 9.10 64bit
nvidia geforce 9400m
driver: nvidia-glx 195.36.15
gnome: 2.28.1
mono: 2.4.2.3