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', '8mof4coc5i50dh1locfve719j2', '54.198.205.153', '1537762591', '1537762591', '/catalog/product_info.php?name=Alpha%20Phi%20Alpha%20Lapel%20Pin%20LGPM&products_id=400')

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