Warning: gethostbyaddr() [function.gethostbyaddr]: Address is not a valid IPv4 or IPv6 address in /home/georg/php-lib/visitor.inc on line 130

SQL Query not successfull

INSERT INTO visitor_log SET
vid = '8f5ba5c7ab0fd8918c22857be18d96b8',
arrived = NOW(),
duration = 10,
info_id = 0,
ip = '',
host = '',
port =

You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '' at line 8