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', 'brfcc0cm8i4lic9c1b678afhj0', '54.156.51.193', '1537340520', '1537340520', '/catalog/default.php?cPath=54_143&osCsid=vqf5bg1u33hnb5goqvtrtall46')

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