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', 't15tst5lpp7ktthvabpkni8oj4', '54.161.116.225', '1540211940', '1540211940', '/catalog/product_info.php?name=Zeta%20Phi%20Beta%20Key%20Chain%20-%20MHK&products_id=577')

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