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', 'm8gpcjdhg34ir5q64c04m9jjc6', '54.198.205.153', '1537760951', '1537760951', '/catalog/product_info.php?name=Mason%20Graduation%20Stole%2090409&products_id=841')

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