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', 'gtt9tgnrgn0ii6ekje304r0cj1', '3.140.198.12', '1715788256', '1715788256', '/store/shopping_cart.php/sort/2a?osCsid=lh8tfkcg5cej67bo6di7tl8bd2')

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