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 ('2d2134f76f0b650c978a6db8b76ea396', -1, 1714000973, 1714000973, '031196a3', -7, 0, 0)

Line : 187
File : sessions.php