What is the error in the script?

I can not understand where is the error?

setInterval(function() {
 if(document.getElementById('id').innerHTML !='No offers')
{
 new Audio ('audio.mp3').play()
}
}, 1000);

Need if there's no text "no Offers", to play a melody.

https://jsfiddle.net/h12Lym7b/
Here fiddl, the melody is played constantly, does not see the conditions.