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', 'spn6888crk28i8qa0c7f4kftl2', '54.166.207.223', '1539814403', '1539814403', '/catalog/contact_us.php?osCsid=4o5mi8sf653d9p4j4jesah05j2')

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