1062 - Duplicate entry '0' for key 'customer_id'

insert into whos_online (customer_id, full_name, session_id, ip_address, time_entry, time_last_click, last_page_url) values ('0', 'Guest', 'j4gq3chvqdmn2jb2qp9o8avuf1', '18.219.162.138', '1715788307', '1715788307', '/store/shopping_cart.php/sort/2a?osCsid=db6uvbuk2jm08n9m9fknmbgdr3')

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