Could not insert search results

DEBUG MODE

SQL Error : 1062 Duplicate entry '1871006221' for key 'PRIMARY'

INSERT INTO phpbb_search_results (search_id, session_id, search_time, search_array) VALUES(1871006221, 'df1a4579bec979ddf7727dde16bc25d0', 1714111242, 'a:7:{s:14:"search_results";s:142:"642277, 644814, 644834, 644837, 644844, 644857, 644859, 644921, 645494, 645752, 651762, 652589, 654173, 665049, 665058, 665080, 665134, 667909";s:17:"total_match_count";i:18;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 : 781
File : search.php