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', 'lt6p2ikaph47bvlnloa12gv6v7', '54.81.150.27', '1537290286', '1537290286', '/catalog/shipping.php?osCsid=sae431ddrejsp9u780nuf4a9p4')

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