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', 'uqcf2m4khnbqkjhrvrcp7ggnq7', '54.80.83.123', '1537522906', '1537522906', '/catalog/default.php?osCsid=m5hoianmc0q0h3pf88thfu27m5')

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