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', '4ia67bk77uef641hq44lpni7b3', '54.81.196.35', '1534736556', '1534736556', '/catalog/default.php?cPath=50&osCsid=ul5eddknpcfjabdtff6i3n2o30')

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