Comment 2 for bug 832066

StacktraceTop:
 g_value_object_collect_value (value=0x7ffff9e7eff0, n_collect_values=1, collect_values=0x7ffff9e7efb0, collect_flags=0) at /build/buildd/glib2.0-2.29.16/./gobject/gobject.c:3068
 gtk_list_store_set_valist_internal (list_store=0x22c7180, iter=0x610740, emit_signal=0x7ffff9e7f058, maybe_need_sort=0x7ffff9e7f05c, var_args=0x7ffff9e7f088) at /build/buildd/gtk+2.0-2.24.5/gtk/gtkliststore.c:802
 IA__gtk_list_store_set_valist (list_store=0x22c7180, iter=0x610740, var_args=0x7ffff9e7f088) at /build/buildd/gtk+2.0-2.24.5/gtk/gtkliststore.c:899
 IA__gtk_list_store_set (list_store=<optimized out>, iter=<optimized out>) at /build/buildd/gtk+2.0-2.24.5/gtk/gtkliststore.c:941
 update_theme_preview_iterate (data=0x22c7180) at src/preview_update.c:123