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', 'bmmgrujp3rd5e81onu2k9oueh0', '54.224.118.247', '1540078428', '1540078428', '/catalog/product_info.php?products_id=647&osCsid=9l76kj1nni3hblp27eo94400r0')

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