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 ('0fb2cd4ba4570e82111a956b06bdc89e', -1, 1728603352, 1728603352, '2cc05fa1', 12, 0, 0)

Line : 189
File : sessions.php