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 ('555e109b9a5e434df20aeed9a082cb4c', -1, 1713541517, 1713541517, '0387d5d6', 3, 0, 0)

Line : 187
File : sessions.php