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', 'i1n739rdvqc2i8usv3oi09aat3', '54.161.116.225', '1540214363', '1540214363', '/catalog/product_info.php?products_id=568&osCsid=ds0ugbmslntrvl1bscre9bipt5')

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