phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '2ff18b86ac1987d59387f6d0d4bb8508' for key 'phpbb_sessions.PRIMARY'

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('2ff18b86ac1987d59387f6d0d4bb8508', -1, 1765906851, 1765906851, 'd849d805', 20, 0, 0)

Line : 187
File : sessions.php