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', 'bg2i7m6okqecvhf739fk7k8pm7', '54.81.150.27', '1537291058', '1537291058', '/catalog/product_info.php?products_id=391&osCsid=ei1vtai1lbl8l1h2r4gcjes9r3')

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