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', 'h9rv4a9tismef9f20mfdduc5l5', '54.92.164.184', '1537965624', '1537965624', '/catalog/product_info.php?name=Sigma%20Gamma%20Rho%20Plastic%20License%20Plate%20Holder%20-%20PFB_4003&products_id=620')

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