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', 'i3adc03ke1m8g9prqimuo07gg2', '54.198.23.251', '1537411690', '1537411690', '/catalog/product_info.php?name=Iota%20Phi%20Theta%20Large%20Letter%20Acrylic%20Keychain%20LLKA&products_id=927')

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