Error message

PDOException: SQLSTATE[23000]: Integrity constraint violation: 1062 Duplicate entry '18.118.171.28' for key 'PRIMARY': INSERT INTO {httpbl} (hostname, status, expire) VALUES (:db_insert_placeholder_0, :db_insert_placeholder_1, :db_insert_placeholder_2); Array ( [:db_insert_placeholder_0] => 18.118.171.28 [:db_insert_placeholder_1] => 0 [:db_insert_placeholder_2] => 1748430542 ) in _httpbl_cache_set() (line 619 of /www/sites/packal/sites/all/modules/httpbl/httpbl.module).