While brief, Menzel's voice noticeably cracks in what would otherwise have been a strong rendition of the hit song. Menzel was performing for the annual Dick Clark's Rockin' New Year's Eve.
And while the live audience loved the performance, online trolls soon started making fun of the flub.
"Maybe Adele Dazeem should sing this song. #LetItGo," "Happy Days" Scott Baio tweeted.
But Menzel wasn't the only performer to have a slip-up at the annual ball drop celebration. Taylor Swift, who also performed at the live event was exiting the stage and was walking down the stairs when she lost her footing in front of throngs of screaming fans.
Thankfully, the star recovered from the slip quickly and walked away unhurt, waving to fans and laughed off the incident like a good sport.