Championship leaders QPR had goalkeeper Paddy Kenny to thank as they came away from Swansea with a point.
The Swans, who came into the match having lost just one of their last 18 at the Liberty Stadium, had a great chance to take the lead in the 39th minute but Kenny kept out David Cotterill's spot-kick to keep the score at 0-0.
Top scorer Jamie Mackie twice went close for QPR after the break, while Kenny was required to make another good save from Darren Pratley's close-range effort.
Second-placed Cardiff closed the gap by beating Coventry 2-1.
Peter Whittingham's early penalty gave the Bluebirds the advantage at the Ricoh Arena, but Gary McSheffrey drew Coventry level a minute before the break.
But the in-form Jay Bothroyd grabbed a late winner for Cardiff which takes them within two points of the summit.
Third-placed Norwich slipped to a shock 2-1 home defeat against struggling Crystal Palace, who recorded their first away win of the season.
Grant Holt's goal just before half-time put Norwich in front but Julian Bennett equalised (56) and a rare goal from on-loan Hull defender Anthony Gardner (63) completed the turnaround.
Managerless Middlesbrough suffered a further setback as Lewis McGugan's 51st-minute strike earned Nottingham Forest a 1-0 win at the City Ground.
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