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', 'l8ar9v7ncbth9gj5ealtnvuuq0', '54.224.56.126', '1539884992', '1539884992', '/catalog/product_info.php?products_id=836&osCsid=d4ngsa8o65960em7hi775spb82')

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