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', 'iki6857i1ri127o2ivv976te32', '54.158.199.217', '1537897833', '1537897833', '/catalog/product_info.php?name=AKA%20SATIN%20Licence%20Plate%20STGR_5301&products_id=517')

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