iOS app keeps playing audio

I am testing an iOS app that has some books with audio and some with none. When an audio file is playing and I go back to the Contents Menu, the audio continues to play. It still continues to play if I go into a book that has no audio. It will only stop once I get into another book that does have audio. Audio is synchronized with the text. The app was built with the latest SAB version and tested on iOS 13.3

This problem has been corrected and will be in the next release. Going back to the contents menu will now halt the audio