1366 - Incorrect integer value: '' for column 'customer_id' at row 1

insert into whos_online (customer_id, full_name, session_id, ip_address, time_entry, time_last_click, last_page_url) values ('', 'Guest', 'jpj967fc9crcr7kqr5i0mvsgv0', '54.224.11.137', '1534860731', '1534860731', '/catalog/product_info.php?products_id=489&osCsid=rbn8hjnui63ulh192dp2cdns04')

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