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', '9j8hbqa1s2sk4vpom9sdprm2d6', '54.81.150.27', '1537290255', '1537290255', '/catalog/product_info.php?products_id=426&osCsid=om3lhnl3cipfrdg3rat21c51n0')

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