Mahon moved from Watford in January and was obviously disappointed with the result.
"I was pleased to get my first goal for the club, but I can't be happy after a result like that," said Mahon.
"But we'll learn from that game, there's no doubt about that. We've had a setback and now we need to get back on a run of wins.
"We've got a break in fixtures now and after that we need to come back from the defeat strongly."