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 ('cebf79564df3c795e1e0a5bed03092c2', -1, 1711618080, 1711618080, '2cc8d22b', -1, 0, 0)

Line : 187
File : sessions.php