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', 'u3hkh1mpbjoa9vrl89ltlnp6q0', '54.161.116.225', '1539804360', '1539804360', '/catalog/privacy.php?osCsid=nivt3a86qnnfe94f7d4ur1s9i3')

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