Wolves and Liverpool were hit by a city-wide power-cut during their FA Cup third round replay.
The two Premier League sides played out a draw in the first game at Anfield.
The return at Molineux on Tuesday involved the lights going off for a few seconds.
Winger Adama Traore was about to cross the ball when the malfunction occurred, leaving players and fans bemused.
The VAR also had to be shut down for a while, but did eventually return in the 16th minute of the game.
Liverpool edged out a nervy game, with Harvey Elliott scoring the winner.
