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', '40mpvqrmbmju6aepogr46ijkl1', '54.156.51.193', '1537313741', '1537313741', '/catalog/product_info.php?name=Alpha%20Kappa%20Alpha%20Key%20Chain%20-%20SPK&products_id=726')

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