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Stade were the better side for almost the entire second period in Cardiff but one lapse in concentration and a clinical finish from Quins paved the way for Nick Evans to steal the silverware with a last-gasp touchline conversion.
Haskell was one of Stade's standout performers with a series of strong carries and big hits but the England flanker stepped out of the defensive line in the move that led to Gonzalo Camacho's 77th minute try.
And while Quins hero Evans was quick to play down his own role in the incredible finish to the Challenge Cup season, Haskell freely admitted that his own error cost Stade the game.
"I've got this feeling in my gut that when I watch the video I'm going to realise that it was my fault we lost the game," said Haskell.
"I think I'll find it was me who came out of the line when I shouldn't have done.
"That makes it even worse. Losing is one thing but then realising you might be to blame is pretty difficult to take, so I'm not sure I'm going to be sleeping too well tonight."
Stade's season has been a disappointing one, with an 11th place finish in the Top 14 falling below even the most pessimistic of expectations.
The Amlin Challenge Cup offered Haskell and co a path into next year's Heineken tournament and a form of redemption for their domestic woes.
And with so much to play for at the Cardiff City Stadium, Stade appeared to be stepping up to the plate when it really counted.
Michael Cheika's men were the dominant force in the 35 minutes that followed the half-time break, with Lionel Beauxis and Martin Rodriguez kicking them six points clear.
And although they had victory cruelly taken away from them in the closing stages, Haskell is convinced Stade can bounce back next season, even if his own future and those of a whole host of star names may lie elsewhere.
"We look around the changing room and see the quality of players we've got and Michael Cheika in charge - this team is going places," added Haskell, who was a Heineken Cup winner with London Wasps in 2007 and has been linked with a return to England and a switch to Australia this summer.
"It's been a difficult season for us but we came here tonight and played some good rugby.
"I've experienced a team when I left Wasps that was going into transition and I came to a club that was going into transition as well. I think we're just coming out of that and this should be a bitter taste that goes into next season and pushes us forward.
"Whether I'm here or not, I think this team is special, I think the coaching staff are special and Max Guazzini the owner deserves victories because of all the hard work he puts in."
