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', '5473dfkb2bie9j05dep5dlcks5', '54.166.203.17', '1537318215', '1537318215', '/catalog/product_info.php?products_id=856&osCsid=5399ua59s3asm2eis4em1msth2')

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