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', 'fes440rusi3lplgru7slor1nq3', '54.80.83.123', '1537836553', '1537836553', '/catalog/product_info.php?name=ZPhiB%20Crest&products_id=166')

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