Millwall had two penalty appeals turned down as they held Huddersfield in the first leg of their League One play-off at the Galpharm Stadium.
The first of those occurred in the opening half when Scott Barron's shot appeared to strike the raised hand of defender Peter Clarke.
Millwall were denied again by referee Darren Deadman when Barron fell under the challenge of Clarke.
The Terriers went close through Jordan Rhodes and Danny Drinkwater.
Striker Rhodes scooped over from six yards from Lee Novak's right-wing cross before Drinkwater, on loan from Manchester United, forced goalkeeper David Forde to push his curling 25-yard free-kick around the post.
Millwall barely ventured into the Huddersfield area and the closest the Lions came in the opening 45 minutes was when referee Deadman dismissed their penalty appeal, much to the annoyance of manager Kenny Jackett.
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