-+ ip_ct_gre_keymap_change(oldexp->proto.gre.keymap_orig, &t);
-+ ip_ct_gre_keymap_change(oldexp->proto.gre.keymap_reply, &inv_t);
++ if (oldexp->proto.gre.keymap_orig)
++ ip_ct_gre_keymap_change(oldexp->proto.gre.keymap_orig,
++ &t);
++ if (oldexp->proto.gre.keymap_reply)
++ ip_ct_gre_keymap_change(oldexp->proto.gre.keymap_reply,
++ &inv_t);