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', 'trpa2t1lfji99h6n8f4ftdtno4', '54.161.77.30', '1539677745', '1539677745', '/catalog/product_info.php?name=AKA%20Graduation%20Stole%2098534%20black%20letters&products_id=826')

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