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', 'j18tamec9btf87kqc8278cgbu1', '54.198.52.82', '1537846266', '1537846266', '/catalog/shopping_cart.php?osCsid=gbp3fm761htkduhtk5lucb7203')

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