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', '0d86471396591bptoemd1qcr52', '54.225.26.44', '1539921087', '1539921087', '/catalog/contact_us.php?osCsid=hd025t40mkll9b5fl884lov3r6')

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