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', 'dlg3h95ta6h1255lqqrbfv4ql3', '54.161.71.87', '1537599900', '1537599900', '/catalog/contact_us.php?osCsid=5399ua59s3asm2eis4em1msth2')

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