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', '15tumsbhp8opd2eeka76a0uhe1', '54.80.58.121', '1537888632', '1537888632', '/catalog/product_info.php?products_id=462&osCsid=53gfk3qp7l61puli9sju3j7ph3')

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