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', 'v3dd7ui9vlr59rp4rp6pt7lbs1', '54.225.26.44', '1539917171', '1539917171', '/catalog/shopping_cart.php?osCsid=5m629metl0qutoonc7h1nd7hj4')

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