"The same thing happened here last year when we lost in the last minute," Lewington said after the game.
"We let it go today. We certainly had the chances and I felt on the balance of play we deserved something out of it, but you have to put your chances away.
"We had a bright first 10-15 minutes. I was pleased with the tempo and we got about Preston.
"At half-time we felt we were well in the match and came back with a quick goal which gave us a lift.
"I can't fault the effort. I think we worked Preston 100%. It was unbelievably hot pitchside - as hot as it gets. Fair credit to all the players."