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', '9bbn4kjumfp7go66laoq6uauc6', '54.156.51.193', '1537315324', '1537315324', '/catalog/default.php?cPath=48&osCsid=bq1vh3pmmdb62gnm62iq9hnsn4')

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