Superswitcher crashes when closing windows which are not on 1st workspace (Compiz)

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What steps will reproduce the problem?
1. Enable Compiz
2. open terminal, run superswitcher
3. Go to second workspace
4. open window, close it, open another and close it
5. see segfault in terminal where superswitcher was run

What is the expected output? What do you see instead?
expected output is that I'm able to switch windows using SS
Instead I see these errors (mostly first one):
(superswitcher:6138): Gtk-CRITICAL **: gtk_container_remove: assertion
`GTK_IS_TOOLBAR (container) || widget->parent == GTK_WIDGET (container)' failed
(superswitcher:6138): Wnck-CRITICAL **: wnck_window_get_xid: assertion
`WNCK_IS_WINDOW (window)' failed

What version of the product are you using? On what operating system?
ArchLinux x86_64
metacity 2.28.1-1
libwnck 2.28.0-1
superswitcher (SVN version)

Please provide any additional information below.

Original issue reported on code.google.com by Kiru...@gmail.com on 13 Feb 2010 at 9:56