phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '-1' for key 'session_user_id'

INSERT INTO satshop_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('2b4bd022142eb63204a7c349f1c56ffe', -1, 1728606089, 1728606089, '2cc05fa1', -4, 0, 0)

Line : 189
File : sessions.php