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', '9tch0cc8go6r49bb347mtugv77', '54.198.52.82', '1537829528', '1537829528', '/catalog/products_new.php?osCsid=f7sqvf13a0ef4untpn2vb5h2a1')

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