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', 'pc3f0l389p914ssu1m8qpv7g76', '54.162.133.222', '1539973990', '1539973990', '/catalog/product_info.php?products_id=472&osCsid=4m52ntd37ks9jmga4d29vrli90')

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