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[Bernhard Schmidt <berni@xxxxxxxxxxxxx>]

I have a very similar (maybe same) problem. My backtrace looks slightly
different

(unity-window-decorator:9108): GLib-GObject-CRITICAL **:
g_object_get_data: assertion `G_IS_OBJECT (object)' failed

Program received signal SIGSEGV, Segmentation fault.
0x0000000000415bab in ?? ()
(gdb) bt
#0  0x0000000000415bab in ?? ()
#1  0x0000003f2840e7fc in g_closure_invoke () from /usr/lib/libgobject-2.0.so.0
#2  0x0000003f28420019 in ?? () from /usr/lib/libgobject-2.0.so.0
#3  0x0000003f28429258 in g_signal_emit_valist ()
   from /usr/lib/libgobject-2.0.so.0
#4  0x0000003f2842941f in g_signal_emit () from /usr/lib/libgobject-2.0.so.0
#5  0x0000003f33c16d44 in ?? () from /usr/lib/libwnck-1.so.22
#6  0x0000003f33c173d4 in ?? () from /usr/lib/libwnck-1.so.22
#7  0x0000003f27042c2d in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#8  0x0000003f27043418 in ?? () from /lib/libglib-2.0.so.0
#9  0x0000003f27043a5a in g_main_loop_run () from /lib/libglib-2.0.so.0
#10 0x0000003f2ed35827 in gtk_main () from /usr/lib/libgtk-x11-2.0.so.0
#11 0x00000000004097f2 in main ()
(gdb) 

I can trigger it reliably sending a mail from thunderbird. When the
submission window (with the progress bar) closes unity-window-decorator
crashes in 10 out of 10 cases.

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https://bugs.launchpad.net/bugs/724874

Title:
  unity-window-decorator crashed with SIGSEGV in
  g_cclosure_marshal_VOID__OBJECT()