phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '-1' for key 'session_user_id'

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('c7b1f9e71a6eebde88dbe9ab0fb6e9e0', -1, 1714341614, 1714341614, '0a020003', -8, 0, 0)

Line : 187
File : sessions.php