Barnet lost the opportunity to reduce the distance between them and National League leader Chesterfield following a 2-0 defeat at home to Gateshead, who are currently fifth in the league.
Stephen Wearne scored twice to put the Bees in fifth place behind the Spireites who won at Southend.
Wearne scored the first goal for Gateshead two minutes into second half.
Wearne scored his third goal in just two matches after he missed his first attempt from 20 yards.