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', 'jupf0davmg19ca9frnslcomg55', '54.156.39.245', '1540216187', '1540216187', '/catalog/product_info.php?products_id=462&osCsid=ij5ov3rlv2vj429let2q3uq1p6')

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