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', 'gm9fflfh85lkdb8t47mh0s1uh4', '54.156.51.193', '1537570864', '1537570864', '/catalog/default.php?cPath=47_55&osCsid=tn1iu4tipmcl8jbnpvf0j7nn92')

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