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', 'pkk531q89af01cbsj3i1q39qf6', '54.156.85.167', '1534628391', '1534628391', '/catalog/product_info.php?products_id=661&osCsid=tgj5p8qje33s4i6adtfv208as4')

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