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', 'iqbm7mhkmj2vslp0pv3fhhcje3', '54.80.87.166', '1540042215', '1540042215', '/catalog/shopping_cart.php?osCsid=fvt4mttekt4ce6lgmtcbpg7hh2')

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