bekomm jetzt noch mehr output

2011-08-10 12:34:05 ldap: isys_exception_database : Query error: 'INSERT INTO isys_person_2_group SET isys_person_2_group__isys_obj__id__person = '89', isys_person_2_group__isys_obj__id__group = '31';':
Cannot add or update a child row: a foreign key constraint fails (idoit_data/isys_person_2_group, CONSTRAINT isys_person_2_group_ibfk_1 FOREIGN KEY (isys_person_2_group__isys_obj__id__person) REFERENCES isys_obj (isys_obj__id) ON DELETE CASCADE ON )

kann jemand damit was anfangen?