Sam Dalby's late header stopped Lincoln going nine points clear of Bolton in the promotion race after he secured the visitors a late point in a 1-1 draw at Sincil Bank.
Michael Skubala's Imps looked destined to make it five straight wins, but they had to settle for a 14th league game without defeat after being held to a draw.
Moylan Punishes a Slow Start
In-form Jack Moylan smashed a strike onto the crossbar in the first five minutes, and the Irishman was then thwarted by Trotters stopper Jack Bonham as he went close once more.