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', '0rnajs6dul9s5usjo42r0apf21', '54.80.96.153', '1537789750', '1537789750', '/catalog/product_info.php?name=Sigma%20Gamma%20Rho%20Key%20Chain%20-%20LLKM&products_id=631')

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