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 ('0b6222a6a6a7631a8520dc15d67b62cc', -1, 1757040372, 1757040372, 'd849d80f', 22, 0, 0)

Line : 247
File : sessions.php