Plymouth Argyle manager John Sheridan said his side's dropped points following a 1-1 draw at Accrington Stanley could prove costly come the end of the season.
The Pilgrims were on course for all three points after top scorer Reuben Reid had fired home his 19th goal of the season in the 32nd minute.
Victory would have boosted Argyle's play-off chances, but instead they dropped to eighth after Accrington defender Tom Aldred headed home an 81st-minute equaliser.
"I'm really disappointed," said Sherdan. "You go 1-0 up and it's all about seeing the game out, but we couldn't do that.
"We gave them opportunities and half chances and our distribution was poor and it has cost us.
"It's a joke and I'm sick of my players giving the opponents chances to cross the ball.
"It was a brilliant opportunity to get three points and it would have cemented our place in the play-offs - now it could prove costly.
"Reuben might have got his 19th of the season, but he could have had his 20th as well.
"This was a game we should have won, but we have let ourselves down."
Accrington boss James Beattie was happier as his side edged closer to safety.
Beattie believes his side will need around 52 points to stay up and they are currently on 45.
"It's another point towards our target - although we might need more than 52 points," said Beattie.
"All we can do is keep trying to win games and see where it takes us.
"We are playing well, the lads are enjoying their football, but they know when to work hard and they have put a superb shift in.
"It was a brilliant performance in tricky conditions due to the weather, but we are now unbeaten in five at home and we have got to carry this on."
The game was in doubt before kick-off due to persistent rain and the pitch was a quagmire.
Plymouth started well with the prolific Reid denied by the legs of home goalkeeper Marcus Bettinelli before he opened the scoring.
The striker received the ball on the left side of the penalty area and drilled it low and hard into the bottom corner.
The game was end-to-end with both side's creating chances and Accrington substitiute Kayode Odejayi should have done better but he headed over the crossbar when unmarked.
Neal Trotman also failed to find the target in a decent position for the visitors before Aldred levelled when he powered home Lee Molyneux's right-wing cross nine minutes from time.