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', 'cilr35appc20u3ci8cdslnq485', '54.80.188.87', '1539847460', '1539847460', '/catalog/default.php?cPath=48&osCsid=bpjv8mp6816sl4329ufsm845h5')

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