phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'ffc80beb848720f8e0da8bf13b965e5b' 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 ('ffc80beb848720f8e0da8bf13b965e5b', -1, 1788787081, 1788787081, 'd849d87c', -9, 0, 0)

Line : 187
File : sessions.php