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', 'br4p19c5p956qfi4o8oigs9k91', '54.156.51.193', '1537313633', '1537313633', '/catalog/product_info.php?name=Iota%20Phi%20Theta%20License%20Plate%20--%20MCLPX_2507&products_id=959')

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