phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'afd6fe255c5739f0e1a009c8a8218451' 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 ('afd6fe255c5739f0e1a009c8a8218451', -1, 1768838007, 1768838007, 'd849d879', -4, 0, 0)

Line : 187
File : sessions.php