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 ('809a4f65ac93777f27f8d88e78a38440', -1, 1713887900, 1713887900, '0d3a963b', -4, 0, 0)

Line : 187
File : sessions.php