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 ('9dbdffb6cbe4bb5b8a423d3cadc3693d', -1, 1713513776, 1713513776, '0395fb9a', 5, 0, 0)

Line : 187
File : sessions.php