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', '9k9ugtmg082pu0banckqoul2i6', '54.198.23.251', '1537410472', '1537410472', '/catalog/product_info.php?name=Iota%20Phi%20Theta%20Plastic%20License%20Plate%20Frame%20--%20%20PFW_4107&products_id=977')

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