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 ('e8ade7ed5d0b1e0ddd4d56e8760c0210', -1, 1754865778, 1754865778, 'd849d8fd', 2, 0, 0)

Line : 189
File : sessions.php