Could not insert search results

DEBUG MODE

SQL Error : 1062 Duplicate entry '1778457046' for key 'PRIMARY'

INSERT INTO phpbb_search_results (search_id, session_id, search_time, search_array) VALUES(1778457046, '600d4f13f1a0afe5a874defe93d2c749', 1714246964, 'a:7:{s:14:"search_results";s:198:"163, 511, 521, 789, 792, 793, 804, 828, 829, 868, 869, 907, 915, 916, 920, 1376, 1408, 1693, 2167, 4155, 4157, 4825, 5918, 8673, 9930, 9944, 9957, 9959, 9967, 9974, 13329, 13829, 18078, 26998, 27002";s:17:"total_match_count";i:35;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 : 706
File : search.php