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', 's9jumjd90r6566fdu1r8eaheq1', '54.162.239.233', '1537401723', '1537401723', '/catalog/product_info.php?products_id=144&osCsid=ei1vtai1lbl8l1h2r4gcjes9r3')

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