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', '0ksgeqe16i5fq51p7vo485hq46', '54.80.83.123', '1537836733', '1537836733', '/catalog/product_info.php?name=Kappa%20Alpha%20Psi%20Large%20Letter%20Wood%20Lapel%20Pin%20LGP&products_id=917')

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