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', '66un5ap833fgb02h5unipa9sc1', '54.161.71.87', '1537394871', '1537394871', '/catalog/default.php?cPath=51_216&osCsid=vpio3bf85o9lb617pett4iq871')

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