Could not insert search results

DEBUG MODE

SQL Error : 1062 Duplicate entry '596969004' for key 'PRIMARY'

INSERT INTO phpbb_search_results (search_id, session_id, search_time, search_array) VALUES(596969004, 'ac7c73c2613809628ad5c61b65559983', 1714314980, 'a:7:{s:14:"search_results";s:6:"847821";s:17:"total_match_count";i:1;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