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', 'n5fde4fulsi4j8vc9fsutdjm53', '54.224.220.72', '1534760900', '1534760900', '/catalog/product_info.php?products_id=472&osCsid=60p7vqr133j78cevlfoq8gjs51')

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