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', '20bfitr307rap8g1n9fe69uo04', '54.198.23.251', '1537409378', '1537409378', '/catalog/product_info.php?name=Eastern%20Star%20Key%20Chain%20-%20OES_SOKA&products_id=691')

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