Brentford's unbeaten run came to an end as they slipped to defeat against Norwich City on Tuesday night.
The Bees matched their opponents for long spells and should have gone in ahead at the break.
However, they shot themselves in the foot midway through the second half as James Tarkowski's loose pass resulted in Alexander Tettey giving the visitors the lead.
The hosts were denied a stonewall penalty when Alex Pritchard was upended in the box by Jos Hooiveld, and that decision proved crucial as Norwich raced up the other end to double their advantage through Jerome.
The former Stoke frontman wrapped up victory with a 25-yard screamer to add gloss to the scoreline.
He said: "If I'm the only one who thinks it's a penalty, I need to go to Specsavers. I'm very disappointed because that incident changed the entire game."