Um erro no Banco de Dados aconteceu

Error Number:

ERROR: invalid input syntax for integer: "evento" LINE 4: AND "id_menu" = 'evento' ^

SELECT * FROM "menu" WHERE "id_portal" = '72' AND "id_menu" = 'evento' AND "ativo" = 1 ORDER BY "ordem"

Filename: /home/web22/producao/application/core/MY_Model.php

Line Number: 41