Audacious crashes because of Oxygen-GTK

When using the Oxygen-GTK theme, audacious (that mostly consists of custom skinning) crashes randomly, quite regularly.

I have included a backtrace of this happening:

(gdb) bt
#0 0x00007fffeb413877 in std::_Rb_tree_decrement(std::_Rb_tree_node_base*) () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
#1 0x00007fffeb764856 in std::_Rb_tree<_GtkWidget*, std::pair<_GtkWidget* const, Oxygen::ShadowHelper::WidgetData>, std::_Select1st<std::pair<_GtkWidget* const, Oxygen::ShadowHelper::WidgetData> >, std::less<_GtkWidget*>, std::allocator<std::pair<_GtkWidget* const, Oxygen::ShadowHelper::WidgetData> > >::_M_insert_unique(std::pair<_GtkWidget* const, Oxygen::ShadowHelper::WidgetData> const&) () from /usr/lib/x86_64-linux-gnu/gtk-2.0/2.10.0/engines/liboxygen-gtk.so
#2 0x00007fffeb7641ce in Oxygen::ShadowHelper::registerWidget(_GtkWidget*) () from /usr/lib/x86_64-linux-gnu/gtk-2.0/2.10.0/engines/liboxygen-gtk.so
#3 0x00007fffeb7642c3 in Oxygen::ShadowHelper::realizeHook(_GSignalInvocationHint*, unsigned int, _GValue const*, void*) () from /usr/lib/x86_64-linux-gnu/gtk-2.0/2.10.0/engines/liboxygen-gtk.so
#4 0x00007ffff5ca9568 in ?? () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#5 0x00007ffff5cb208d in g_signal_emit_valist () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#6 0x00007ffff5cb22c2 in g_signal_emit () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#7 0x00007ffff6603e0e in gtk_widget_realize () from /usr/lib/x86_64-linux-gnu/libgtk-x11-2.0.so.0
#8 0x00007ffff660e2c5 in ?? () from /usr/lib/x86_64-linux-gnu/libgtk-x11-2.0.so.0
#9 0x00007ffff5c9807a in ?? () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#10 0x00007ffff5cb1ba5 in g_signal_emit_valist () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#11 0x00007ffff5cb22c2 in g_signal_emit () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#12 0x00007ffff6604dc6 in gtk_widget_show () from /usr/lib/x86_64-linux-gnu/libgtk-x11-2.0.so.0
#13 0x00007ffff751abf4 in audgui_infopopup_show () from /usr/lib/libaudgui.so.1
#14 0x00007fffe5bddcf5 in ?? () from /usr/lib/audacious/General/skins.so
#15 0x00007ffff6c3198b in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#16 0x00007ffff6c30d4a in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#17 0x00007ffff6c31110 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#18 0x00007ffff6c3150a in g_main_loop_run () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#19 0x00007ffff64dfe97 in gtk_main () from /usr/lib/x86_64-linux-gnu/libgtk-x11-2.0.so.0
#20 0x0000000000410c28 in ?? ()
#21 0x00007ffff4c6a30d in __libc_start_main () from /lib/x86_64-linux-gnu/libc.so.6
#22 0x000000000040c2d9 in ?? ()
#23 0x00007fffffffe118 in ?? ()
#24 0x000000000000001c in ?? ()
#25 0x0000000000000001 in ?? ()
#26 0x00007fffffffe482 in ?? ()
#27 0x0000000000000000 in ?? ()

Usually, after a crash, when audacious is restarted, it will crash instantly. I can usually get it running by keep trying to restart it, until it no longer SIGSEGVs on startup. This seems like a clear race condition. With any other theme, this does not happen.

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: audacious 2.4.4-1
ProcVersionSignature: Ubuntu 3.0.0-17.30-generic 3.0.22
Uname: Linux 3.0.0-17-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 1.23-0ubuntu4
Architecture: amd64
Date: Sat Mar 31 19:44:05 2012
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111011)
ProcEnviron:
 LANGUAGE=en_DK:en
 PATH=(custom, user)
 LANG=en_DK.UTF-8
 SHELL=/bin/zsh
SourcePackage: audacious
UpgradeStatus: No upgrade log present (probably fresh install)