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 ('2ff84a3e7ceb0d5b08c06f0e5b3405ba', -1, 1713859547, 1713859547, '038cb993', 6, 0, 0)

Line : 187
File : sessions.php