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', '23vl0f9tg4kl09ala4cefst2c4', '54.156.51.193', '1537574226', '1537574226', '/catalog/product_info.php?products_id=596&osCsid=23ak8qpvqq3l1m0g2v25uku2e7')

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