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', '4kir22s0kiah66ok75hco7ud81', '54.156.39.245', '1539736866', '1539736866', '/catalog/product_info.php?products_id=830&osCsid=jaoib9ss6aqb210fpiest4b537')

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