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', 'dvel4mh1vji404ukf5q7mbku30', '54.156.39.245', '1539736108', '1539736108', '/catalog/shopping_cart.php?osCsid=kh53p1hgvrf3vlqsi0r7bpoba5')

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