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', '0u9dbn9tea8uq6s8prjkltcvm1', '54.81.150.27', '1537290251', '1537290251', '/catalog/default.php?cPath=56&osCsid=89djt8s0tq3nsc30jbhsjprhe2')

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