Comment 2 for bug 903474

select * from res_portal;
 id | create_uid | create_date | write_date | write_uid | url | menu_action_id | group_id | parent_menu_id
----+------------+----------------------------+----------------------------+-----------+-----------------------------+----------------+----------+----------------
  2 | 1 | 2011-12-11 22:16:53.735274 | 2011-12-12 07:09:18.077708 | 1 | http://192.168.160.136:8169 | | 88 | 720

there is an entry in res_portal
imho the sql statement must also check for parent_menu_id in res_portal, then it will not raise an error.