At Christmas, Forest beat Crystal Palace in a game that was heavily influenced by the VAR.
When he prodded home from close range after Guaita parried from Brennan Johnson, he was initially thought to be in the clear.
After a long delay, the video assistant referee awarded the goal and it was the winner.
It was Palace who were to blame for the defeat, as they were the ones who failed to take a penalty after Joe Worrall was found guilty of bringing him down.
The victory lifts Forest off the foot of the table as they climb two places to 18th, while Palace remain 11th.
The video assistant was just as busy as the on-field referee during the game at the City Ground.
When Tyrick Mitchell brought down Jesse Lingard just outside the area in the first half, he should have been sent off.
There was a long time to decide whether the Palace penalty was a good one or not, and it was difficult to make a decision.
The point was rendered meaningless when the spot- kick clipped the outside of the post.
There was more for VAR to do as a booking was deemed suitable punishment for Ryan Yates' challenge on Jeffrey Schlupp's ankle.
Palace failed to register a single shot on target as Forest comfortably saw out victory.
Only three teams have stayed up after being at the bottom of the league at Christmas, and Forest are one of them.
Due to the month-long break for the World Cup, there will be more games played in the second half of the season than in the past.
Steve Cooper's new-look side have responded to five straight defeats by winning two and drawing three of their seven matches since then.
The result might have been different if Palace had scored from the spot but this was a strangely lethargic display from their side.
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