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', 'tf040vfmmv18i136vo3mtsn4c3', '54.224.56.126', '1539842546', '1539842546', '/catalog/default.php?cPath=54_144&osCsid=jss3de1sokfb661qqgdi8htd11')

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