phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '4f9f1f6c237cc7a14f2619aa7b5b6ffd' for key 'PRIMARY'

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('4f9f1f6c237cc7a14f2619aa7b5b6ffd', -1, 1711651311, 1711651311, '2ccab776', -9, 0, 0)

Line : 187
File : sessions.php