Celtic saw their Premiership lead cut to four points as they were held to a frustrating home draw by Dundee.
The champions, with Patrick Roberts making his first start, created enough chances but saw Aberdeen, 1-0 winners at Dundee United, narrow the gap.
Charlie Mulgrew, Tom Rogic and Leigh Griffiths were all denied an opener.
As the visitors grew more assured, Craig Wighton forced Craig Gordon into action while Kostadin Gadzhalov and Gary Harkins missed good late chances.
Dundee still moved up to fifth on goal difference above St Johnstone, who were beaten 2-1 at home by Partick Thistle.
But Celtic were booed off after a second successive draw.
More to follow.