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', '9jh5l7u27dtkbs64hcds6dc851', '54.198.142.121', '1537921611', '1537921611', '/catalog/shopping_cart.php?osCsid=r88vi6a93iv21cq22550o2k7g6')

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