A Cube Entertainment artist�Mario recently unveiled a new digital single entitled "Text Message" featuring singer�Baek Ji Young.

To help promote the song, Mario performed on February 12th's episode of�'Inkigayo' along with�4minute's Gayoon. The stage was set for a beautiful performance, as Mario brought on a live orchestra to support him, and Gayoon stepped out in a sophisticated ensemble.

Unfortunately, the performance experienced a hiccup during the middle.

As the song built towards its climax, Gayoon's voice fell flat and she missed a powerful note. Though she was a bit disheartened by the mistake, Gayoon rallied her spirits and strove to finish the rest of the song with Mario.

Immediately after the performance, fans left comments on SNS services on how Gayoon looked a little ill, and expressed sympathy for the young star.

Check out Gayoon and Mario's performance below�[the error can be heard around the 2:10 mark]: