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', 'de7jbg3o2mf0ummr0n8g64pgh4', '54.198.52.82', '1537606801', '1537606801', '/catalog/product_info.php?name=Alpha%20Kappa%20Alpha%20Key%20Chain%20-%20DKC&products_id=709')

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