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', 'j6a9cfqamgmcuas8uhcicf8ld1', '54.198.23.251', '1537413230', '1537413230', '/catalog/default.php?cPath=29&osCsid=f1onp02o024i1agcog39noc974')

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