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', '9ivb5q7lvag3l3dnq2nm2de224', '54.156.39.245', '1539609930', '1539609930', '/catalog/shipping.php?osCsid=qbn1tehcn2mbo2rg49jaj6ama3')

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