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', '50cpt2p14jjg47d5gab90nkk16', '54.81.150.27', '1537438588', '1537438588', '/catalog/products_new.php?osCsid=j1pn1935g4mf5367pc76idh9t1')

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