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', 'q4gd93p8v8b3ecv34a7g11thk3', '54.198.23.251', '1537409387', '1537409387', '/catalog/product_info.php?name=Alpha%20Phi%20Alpha%20License%20Plate-%20MCLPS_2305&products_id=380')

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