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 ('f91237d3deb4200c5ec8f8f2e40ed9d5', -1, 1713588813, 1713588813, '2cd463d0', -8, 0, 0)

Line : 187
File : sessions.php