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', 'n653n9haapk6qpvepf89ifgko0', '54.156.51.193', '1537313831', '1537313831', '/catalog/product_info.php?name=Sigma%20Gamma%20Rho%20Key%20Chain%20-%20LLKS&products_id=632')

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