phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'a9b86a4d5d05cb1715004023d24853d7' for key 'PRIMARY'

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in) VALUES ('a9b86a4d5d05cb1715004023d24853d7', -1, 1768520874, 1768520874, 'd849d80d', -9, 0)

Line : 180
File : /www/includes/sessions.php