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', 't9k51h001la3plqrev97bg87j5', '54.198.142.121', '1537921634', '1537921634', '/catalog/product_info.php?name=Iota%20Phi%20Theta%20Domed%20Medallion%20DMED&products_id=912')

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