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 ('5ac4383958aa7d7a8e786a3f6f662fc2', -1, 1757040534, 1757040534, 'd849d80f', 22, 0, 0)

Line : 247
File : sessions.php