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', 'd5mdmjcfeoek4qp7l825f3gsl1', '54.162.239.233', '1537826459', '1537826459', '/catalog/contact_us.php?osCsid=6p2tlea0v00tceh1jnku68s5c6')

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