Comment 2 for bug 890641

StacktraceTop:
 g_object_unref (_object=0x2d7) at /build/buildd/glib2.0-2.30.0/./gobject/gobject.c:2680
 _gtk_tree_data_list_value_to_node (list=0xb2d8800, value=0xbf901c1c) at /build/buildd/gtk+2.0-2.24.6/gtk/gtktreedatalist.c:239
 gtk_tree_store_real_set_value (tree_store=0xa299700, iter=0xa2621ec, column=<optimized out>, value=0xbf901c1c, sort=1) at /build/buildd/gtk+2.0-2.24.6/gtk/gtktreestore.c:825
 IA__gtk_tree_store_set_value (tree_store=0xa299700, iter=0xa2621ec, column=0, value=0xbf901c1c) at /build/buildd/gtk+2.0-2.24.6/gtk/gtktreestore.c:860
 pygtk_tree_model_row_setitem (self=0xa2621e0, column=0, pyvalue=<gtk.Image at remote 0xa002eb4>) at /build/buildd/pygtk-2.24.0/gtk/gtk-types.c:1081