Floodlight failure has forced the postponement of the First Division game between Dundee and Ayr United.
The news came less than half an hour before kick-off at Dens Park.
It had been re-arranged because of Ayr's participation in the Scottish Cup quarter-finals at the weekend, when they lost 2-0 to Hibernian.
Dundee's website stated: "Tonight's game against Ayr United has been called off due to an irrepairable fault in the floodlights."
The Dark Blues were hoping for a victory that would put them level on points with second-placed Falkirk, while Ayr were aiming to move into seventh place.
Brian Reid's side are two points above Raith Rovers, who presently sit second-bottom and in the relegation play-off space, with a game in hand.
The postponement means Morton have the chance to move four points clear of Ayr and leapfrog Hamilton Accies into sixth place after the only Scottish fixture left on Tuesday.
However, to do so, the Greenock side will have to defeat in Dingwall runaway leaders Ross County, who will move 14 points clear at the top should they win their own game in hand.