Could not insert search results

DEBUG MODE

SQL Error : 1062 Duplicate entry '340541861' for key 1

INSERT INTO phpbb_search_results (search_id, session_id, search_time, search_array) VALUES(340541861, '5dc4d8f7194736ce1a1ff3015383ff84', 1276884645, 'a:7:{s:14:"search_results";s:830:"301959, 301961, 302409, 302410, 306928, 307351, 307354, 307368, 307838, 307854, 307857, 307886, 308415, 310121, 310125, 311525, 311526, 315102, 315103, 318858, 320383, 322055, 322057, 323142, 323969, 323991, 325318, 325875, 326261, 326262, 326642, 327071, 327072, 327076, 327080, 327085, 327089, 327390, 328365, 328417, 328418, 328434, 328463, 328922, 328927, 328933, 328937, 328940, 328961, 328993, 328994, 329001, 329007, 329010, 329013, 329032, 329343, 329344, 329346, 329355, 329366, 329370, 329377, 329380, 329442, 329463, 330264, 330304, 330307, 330411, 331128, 331161, 331163, 331166, 331844, 331846, 332500, 332509, 332526, 332527, 332550, 333503, 333519, 333530, 333582, 333583, 333584, 333588, 333933, 333956, 334751, 334947, 334986, 334990, 335663, 335664, 336154, 336339, 336340, 336341, 336360, 336374, 336826, 336842";s:17:"total_match_count";i:104;s:12:"split_search";N;s:7:"sort_by";i:0;s:8:"sort_dir";s:4:"DESC";s:12:"show_results";s:5:"posts";s:12:"return_chars";i:200;}')

Line : 707
File : search.php