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', '4gi2vq1mlar1mktlaqm4crcdr2', '54.166.130.157', '1540317042', '1540317042', '/catalog/shopping_cart.php?osCsid=grbbvihe9q6m9v8vq9j3bo8867')

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