phpBB : Erreur Critique

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'f31f6415bc96ceeb7531879dcff100fc' 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 ('f31f6415bc96ceeb7531879dcff100fc', -1, 1768827777, 1768827777, 'd849d87f', 5, 0, 0)

Line : 187
File : sessions.php