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', '2mrj4pk8jajgnnbn99cqbk9sj0', '54.161.116.225', '1540208135', '1540208135', '/catalog/product_info.php?name=Delta%20Sigma%20Theta%20License%20Plate%20-%20STSR_5102&products_id=507')

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