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', '2gifo0lg0me6ikrp0b44obdl43', '54.224.247.42', '1539811969', '1539811969', '/catalog/password_forgotten.php?osCsid=tse8844s5rehtenr7b2drqre44')

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