Middlesbrough head coach Kim Hellberg says his side conceded two "terrible goals" to send them to defeat in the top-of-the-table Championship clash at Coventry City.
Trailing 1-0 at half-time, Boro let in a goal from goalkeeper Carl Rushworth's long kick and then after reducing the deficit to 2-1, Matt Targett's needless handball allowed Haji Wright to complete his hat-trick and seal a 3-1 success for the Sky Blues.
It ended Boro's six-match winning run and allowed the Sky Blues to jump back above them, one point clear at the top.
"The second half in general was very good from us," Hellberg told BBC Radio Tees.
"We created a lot of opportunities and we had two good chances but ended up conceding with a kick behind our line that bounced in our penalty box and it's a terrible goal to concede.
"We built momentum again, scored to make it 2-1 and had a lot of energy for that last part of the game and then it's a handball from nowhere.
"You cannot give away those type of goals to a very good team.
"Terrible timings, terrible goals. They don't have to play in our half but they've almost got two goals from never being there."