phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'aff1896f6e219c95c5c2957c7f4e8491' 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 ('aff1896f6e219c95c5c2957c7f4e8491', -1, 1766961673, 1766961673, 'd849d82e', -4, 0, 0)

Line : 187
File : sessions.php