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', '4csuo86e15or1u6puiolfgmev0', '54.81.150.27', '1537438593', '1537438593', '/catalog/contact_us.php?osCsid=alc6etv3ckpcp7ahc5mh6h78m6')

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