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', 'balggd3i1im18eu5ris0lha6k1', '54.224.89.34', '1540194081', '1540194081', '/catalog/product_info.php?name=Delta%20Sigma%20Theta%20Lapel%20Pin%20-%20LGPM&products_id=514')

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