Norwich moved five points clear at the top of the Championship but failed to score for a second successive league game as they were held at Millwall.
The hosts had the better of the few opportunities as Kenneth Zohore headed over and Scott Malone dragged an effort wide when well-placed.
The Canaries, who also drew 0-0 with Middlesbrough on Saturday, have now failed to score in their past three games.
Jed Wallace had a great chance to win it with the last kick of the game when some bizarre overplaying from the visitors left him with an open goal from 40 yards out but he could not get his shot on target.