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', '21t9qdb6lbb3vmvrhhpt0n1nd5', '54.80.140.29', '1534510590', '1534510590', '/catalog/default.php?cPath=52_187&osCsid=oe5ak0804t5l4mlf4mjn2atbc5')

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