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', 'htnmlkn5c964dm9r13369lear7', '54.166.203.17', '1537675391', '1537675391', '/catalog/default.php?cPath=51&osCsid=1u5ppmsfsvv1sbn3fei7luh0d6')

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