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', '7mq56mkqdv266j2e2fc8vv04d0', '54.198.23.251', '1537412159', '1537412159', '/catalog/product_info.php?name=Sigma%20Gamma%20Rho%20License%20Plate%20-%20STSR_5103&products_id=617')

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