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 ('667b31c9c3406e39b0ccd4bb235c0311', -1, 1762681287, 1762681287, 'd849d890', 15, 0, 0)

Line : 172
File : sessions.php