[MonoTouch] exception when quitting monodevelop

[Mike Bluestein]

I'm getting this error every time I quit MonoDevelop:

System.NullReferenceException: Object reference not set to an instance of an
object
  at MonoDevelop.Components.Docking.CustomFrame.OnSizeRequested
(Gtk.Requisition& requisition) [0x00000] in
/Users/michael/Mono/md-release/main/src/core/MonoDevelop.Dock/DockItemContainer.cs:307
  at Gtk.Widget.sizerequested_cb (IntPtr widget, IntPtr requisition)
[0x00000]

I tried reinstalling it but that didn't help.
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