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', 'bi393c6spi7n12hb2m2tvv9j46', '54.198.205.153', '1537761606', '1537761606', '/catalog/product_info.php?name=Phi%20Beta%20Sigma%20Plastic%20License%20Plate%20Holder%20-%20PB_4009&products_id=763')

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