Substitute Kristian Dennis scored a controversial stoppage-time winner for Chesterfield beat Yeovil 2-1 in Sky Bet League Two.After a drab first half the visitors took the lead in the 66th minute through a Glovers error when a lack of communication from Bevis Mugabi and Jordan Green saw Chris O'Grady fouled and Louis Reed stepped up to convert the resultant free-kick from 20 yards.From nothing Yeovil were level in the 80th minute when Lewis Wing, having come on 11 minutes earlier, received possession from 25 yards and sent a looping shot over the hapless Aaron Ramsdale.Yet as the hosts pushed for a second Otis Khan felt he was fouled when his shirt was pulled, but nothing was given and the ball was lofted up-field allowing Dennis to turn Artur Krysiak and put it into the empty net in the third minute of extra-time.In the aftermath the Khan shoved referee Kevin Johnson and received a straight red card.