Shot Clock Error

[c'mon mendy]

White has the ball near their basket. They lose possession with about 7 seconds left on the shot clock. Red now has possession of the ball and as they are in transition to their basket, but before they attempt a shot, the shot clock horn sounds because the shot clock operator forgot to reset the shot clock when white lost possession of the ball. When the shot clock buzzer sounds red stops playing. What is the correct call? Do you penalize red for not continueing to play when no whistle was blown? Do you stop the game and put 23 seconds on a remaining shot clock for red?