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', '815s68f0e63da7mu30l4pcgjc0', '54.156.39.245', '1539610281', '1539610281', '/catalog/product_info.php?name=Iota%20Phi%20Theta%20Silver%20Metal%20License%20Plate%20Frame%20--%20%20DPFS&products_id=980')

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