Crash when clicking on System: '/apps/sysinfo/window_width'

sysinfo crashes when I click on "system": GConf.NoSuchKeyException: Key '/apps/sysinfo/window_width' not found in GConf.

For me it crashes with the following backtrace, obviously when trying to get "window_width":

% sysinfo
GConf.NoSuchKeyException: Key '/apps/sysinfo/window_width' not found in GConf
at GConf.Client.Get (System.String key) [0x00000]
at Sysinfo.Sysinfo..ctor (System.String[] args) [0x00000]
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 Sysinfo.SystemInfo.Xorg () [0x00000]
at Sysinfo.Sysinfo.on_notebook1_switch_page (System.Object o, Gtk.SwitchPageArgs e) [0x00000]
at Gtk.Notebook.SwitchPageSignalCallback (IntPtr arg0, IntPtr arg1, UInt32 arg2, IntPtr gch) [0x00000]
at GLib.ExceptionManager.RaiseUnhandledException(System.Exception e, Boolean is_terminal)
at Gtk.Notebook.SwitchPageSignalCallback(IntPtr arg0, IntPtr arg1, UInt32 arg2, IntPtr gch)
at Gtk.Notebook.gtk_notebook_set_current_page(IntPtr , Int32 )
at Gtk.Notebook.set_CurrentPage(Int32 value)
at Sysinfo.Sysinfo.on_treeview1_cursor_changed(System.Object o, System.EventArgs e)
at System.Reflection.MonoMethod.InternalInvoke(System.Object , System.Object[] , System.Exception ByRef )
at System.Reflection.MonoMethod.Invoke(System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture)
at System.Reflection.MethodBase.Invoke(System.Object obj, System.Object[] parameters)
at System.Delegate.DynamicInvokeImpl(System.Object[] args)
at System.MulticastDelegate.DynamicInvokeImpl(System.Object[] args)
at System.Delegate.DynamicInvoke(System.Object[] args)
at GLib.Signal.ClosureInvokedCB(System.Object o, GLib.ClosureInvokedArgs args)
at GLib.SignalClosure.Invoke(GLib.ClosureInvokedArgs args)
at GLib.SignalClosure.MarshalCallback(IntPtr raw_closure, IntPtr return_val, UInt32 n_param_vals, IntPtr param_values, IntPtr invocation_hint, IntPtr marshal_data)
at Gtk.Application.gtk_main()
at Gtk.Application.Run()
at Sysinfo.Sysinfo..ctor(System.String[] args)
at Sysinfo.Sysinfo.Main(System.String[] args)