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', '4h55l4iedn31vd7seldk05k7g0', '3.21.104.72', '1715788509', '1715788509', '/store/product_info.php/cPath/22/products_id/158?osCsid=4q17uhbcrhkjpidce18049kpk6')

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