1062 - Duplicate entry '16777215' for key 'PRIMARY'

insert into user_tracking (customer_id, full_name, session_id, ip_address, time_entry, time_last_click, last_page_url, page_desc, referer_url) values ('0', 'Spider: 54.197.215.146', 'ccbot/2.0 (http://commoncrawl.org/faq/)', '54.197.215.146', '1406123812', '1406123812', '/product_info.php?info=p5.html', 'test', ' -- ')

[XT SQL Error]