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', '89123lkj93vdfakiamg1ccetv6', '54.224.89.34', '1540192567', '1540192567', '/catalog/product_info.php?products_id=725&osCsid=eafv6ikl3pru4tn4vdiu38lbe2')

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