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', '820nndkri2tnhs2el2jkd8ult7', '54.145.83.79', '1539744932', '1539744932', '/catalog/shopping_cart.php?osCsid=dfdm6bjp57fo37le0fabfdmvc4')

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