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 ('df18d238c732721d9e91e309eac0fcec', -1, 1714242750, 1714242750, '0a020003', 1, 0, 0)

Line : 187
File : sessions.php