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 ('bb2c149476873f10ed79e369609e6ecd', -1, 1713563321, 1713563321, '0387c631', -6, 0, 0)

Line : 187
File : sessions.php