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', '81lggd1cc5ch5epfg6thsfrvc2', '54.162.15.31', '1537584789', '1537584789', '/catalog/product_info.php?products_id=599&osCsid=6le59n4s1nqaala6mm089vb517')

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