Worcester director of rugby Dean Ryan was "astounded" after a late penalty saw his side beaten 20-18 by London Irish in the Aviva Premiership.
Marland Yarde scored a pair of tries but it was Ian Humphreys who was the match-winner with four minutes left after Ed Shervington was penalised.
And Ryan fumed: "For the second week in a row there has been some random refereeing.
"There is an element of ill-discipline but I believe we are not getting a fair crack and I was astounded by the award of the last penalty."
Ryan shared the blame around to his players, though, after they failed to build on a strong position in the match.
"At 10-3 up, we were in control of the game and playing to our structural plan," he said.
"They were down to 14 men but our ability to keep sides under pressure is non-existent. We should have gone on to be 20 points up but we failed to nail it.
"We have good footballers in this side but we need maturity as we are undoing all our good work by blowing pressure situations."
Opposition director of rugby Brian Smith though accepted Irish were somewhat fortunate after the late drama.
"I know they'll be disappointed as you hate to lose games in that fashion," he said.
"The teams were evenly matched, it was see-saw stuff and we nicked it at the end but we played with great spirit."
Smith hailed two-try hero Yarde and said: "His finish is lethal and he is as good as there is in the game.
"He was finding his feet last season but now he's the real deal. His biggest strength is his willingness to learn but I believe there's still 25 per cent improvement to come."