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', 'j8slm13migvm9gub8suu84jna6', '54.92.164.184', '1537968596', '1537968596', '/catalog/product_info.php?name=AKA%20Graduation%20Stole%2098535%20white%20letters&products_id=828')

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