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', '42a1e1kg9gbhs36rb07784tnh0', '54.81.150.27', '1537293119', '1537293119', '/catalog/shopping_cart.php?osCsid=3ka07mf5u46tit5o2t364nrh73')

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