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', '5gtlbi8ll5mvg9sd9h84ei5gi1', '54.225.26.44', '1540275265', '1540275265', '/catalog/product_info.php?products_id=150&osCsid=hdu5vkilg3o0qa1treq66p3ho7')

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