Defender Luis Hernandez was furious that Barcelona's first goal against Malaga was allowed to stand on Saturday, saying the ball was "half a metre out."
"I can understand that they say it didn't go out, but it's absurd," he said. "The ball was half a metre out over the line. Once again, a decision is made that we suffer from."
"I always say that the referee's job is a difficult one, but we conceded a goal against Eibar that was offside and another one against Valencia last Sunday.
"There have been nine games and I think it's enough now. Of those nine games, in six we've conceded a goal becuase of a refereeing error.
"With one point, we're not doing things well... but these decisions don't help, especially at a ground like this because in the second minute we've been left with a mountain to climb."
Gerard Deulofeu scored Barça's first goal in the 2-0 win, converting Lucas Digne's cross, but the ball had already gone out of play before the Frenchman passed it.
Andres Iniesta scored the second goal in the second half as Barça extended their unbeaten run to 12 games in all competitions.