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 ('a0b0b9489db59c56b0070c68f4776536', -1, 1728662217, 1728662217, '2cc87ad6', -8, 0, 0)

Line : 189
File : sessions.php