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', '9t3r16ntjeerl2vt6493sd4n81', '54.80.83.123', '1537521941', '1537521941', '/catalog/default.php?cPath=49&osCsid=go2a6vh4k562stpmjrtjv6ug45')

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