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', 'jeuf56g0t9s51jrrkb9oo8j6f3', '54.224.247.42', '1540202995', '1540202995', '/catalog/product_info.php?name=Alpha%20Phi%20Alpha%20Mirror%20Heart%20KeyChain%20MHK&products_id=392')

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