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', 'vkvmaq3lumml0li42k7pfqbqq0', '54.224.247.42', '1540204166', '1540204166', '/catalog/product_info.php?name=Alpha%20Phi%20Alpha%20License%20Plate-%20MCLPG_2405&products_id=378')

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