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', '13rsdt269nvs201hf4i8e3jko6', '54.224.56.126', '1540288491', '1540288491', '/catalog/shopping_cart.php?osCsid=hd025t40mkll9b5fl884lov3r6')

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