Derby boss Nigel Clough again rued goalkeeping errors in the 2-0 home defeat to Bristol City.
Rams stopper Brad Jones allowed a Jon Stead shot to squirm under his body before Cole Skuse's second half strike secured a win for the Robins.
Clough said: "We would have liked a performance more like those before Christmas or in the last few weeks but the goalkeeping error demoralised us to a certain degree.
"Their goalkeeper has made two or three very good saves and ours has cost us the first goal which has happened in seven or eight of the home games this season. It's strange that the majority of errors in that position have been at home.
"I thought we were a little bit lethargic at times, not much energy which is understandable in some ways when we are safe, but as much as anything emphasises and probably highlights the need for us to get some players in which we have talked about in the last few weeks."
By contrast, Bristol counterpart Keith Millen had nothing but praise for his stopper.
"We know Dean (Gerken) is a terrific keeper, he's had to play second fiddle to David James for the whole season and he keeps his head down and works hard so I had no worries about him producing a performance and he did.
"I was really pleased he kept a clean sheet.
"David understood, him and Dean get on really well, they work well together in training. He was disappointed he was missing his first league game this year, he's proud of that record but he also understood that Dean deserved a game today. It's great for me I'm in a position where I've got such great goalkeepers at the club.
"We've conceded too many goals, but that's 14 defenders I've used this season which shows it's very difficult to be consistent defending when you have to make that many changes so hopefully we will be luckier with injuries next year."