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', 'etmt867uvr5fhpohjl48hu6ob3', '54.156.39.245', '1539610045', '1539610045', '/catalog/products_new.php?osCsid=o784raee59n7cb4v99gl80tir1')

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