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', '5j6p4sejjagba10rut1p38jug1', '54.224.89.34', '1540193341', '1540193341', '/catalog/shipping.php?osCsid=c6f41puf5s64hujmrb9foetqu5')

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