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 ('05db878fc2faa690c07a1430abf9b19f', -1, 1714030358, 1714030358, '0315686d', -4, 0, 0)

Line : 187
File : sessions.php