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 ('740aff14e94f468aa986fd578cee1b05', -1, 1711643321, 1711643321, '03e64c99', -7, 0, 0)

Line : 187
File : sessions.php