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', '15i7728dphafu6db7g3e26nbb1', '54.224.247.42', '1539959673', '1539959673', '/catalog/default.php?cPath=53&osCsid=8tdii0998tqq1tk2s4ls3l8ga6')

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