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', 'td56bkokdfmicc7agg8tbu7ts1', '54.198.23.251', '1537409523', '1537409523', '/catalog/product_info.php?name=AKA%20Plastic%20License%20Plate%20Frame%20PFBF4201&products_id=349')

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