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', 'iqk2dj62trs0arh2sbd5utone6', '54.161.116.225', '1540211071', '1540211071', '/catalog/product_info.php?name=Sigma%20Gamma%20Rho%20License%20Plate%20-%20STSBG_6103&products_id=615')

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