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', '9kot7th88q57s0j041n90umlr6', '54.224.89.34', '1540199750', '1540199750', '/catalog/default.php?cPath=48&osCsid=ubrdssd4s064q9i1qstrtsn7l3')

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