phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '-1' for key 'session_user_id'

INSERT INTO sub_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('18d1a4e4aa6563c1a99972a2f6fb0a4b', -1, 1714517515, 1714517515, '0311064b', -4, 0, 0)

Line : 187
File : sessions.php