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', '6cb216p6pmnemp10lr6odj01o1', '54.224.166.141', '1537654648', '1537654648', '/catalog/shipping.php?osCsid=neqtv5akom3c5usri8emvitf01')

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