Comment 2 for bug 1021612

StacktraceTop:
 g_data_set_internal (dataset=0x0, new_destroy_func=0, new_data=0x0, key_id=52, datalist=0x9913f38) at /build/buildd/glib2.0-2.33.3/./glib/gdataset.c:373
 g_datalist_id_set_data_full (datalist=datalist@entry=0x9913f38, key_id=52, data=data@entry=0x0, destroy_func=destroy_func@entry=0) at /build/buildd/glib2.0-2.33.3/./glib/gdataset.c:680
 g_object_real_dispose (object=0x9913f30) at /build/buildd/glib2.0-2.33.3/./gobject/gobject.c:1011
 gtk_object_dispose (gobject=0x9913f30) at /build/buildd/gtk+2.0-2.24.10/gtk/gtkobject.c:426
 gtk_widget_dispose (object=0x9913f30) at /build/buildd/gtk+2.0-2.24.10/gtk/gtkwidget.c:8775