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 ('6cfa8aefe88c7e910285eb1b2e5fe3c3', -1, 1714026967, 1714026967, '1276a662', -4, 0, 0)

Line : 187
File : sessions.php