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', 'lrrsj6rtv9nncki1dj7t2p8eo4', '54.224.166.141', '1537654561', '1537654561', '/catalog/product_info.php?products_id=599&osCsid=o18emcup1h7favgldi1cstias4')

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