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', '976jtiel9sklqlupt170j8p3f3', '54.81.150.27', '1537448117', '1537448117', '/catalog/default.php?cPath=50_137&osCsid=60mm76ico0aquceh21l1974sc3')

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