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 ('4038d74b03e9a99d6c291fdde27d7701', -1, 1708466425, 1708466425, '2cc014f0', -4, 0, 0)

Line : 187
File : sessions.php