codeacademy if/else javascript

I am follow the course of CodeAcademy for JS, but there's a problem, the script work but I

console.log("You are at a Justin Bieber concert, and you hear this lyric 'Lace my shoes off, start racing.'");
console.log("Suddenly, Bieber stops and says, 'Who wants to race me?'");
var userAnswer = prompt("Do you want to race Bieber on stage?");

if(userAnswer === "yes") {
    console.log("You and Bieber start racing. It's neck and neck! You win by a shoelace!");
}
else {
    console.log("Oh no! Bieber shakes his head and sings 'I set a pace, so I can race without pacing.'");
}

Give me error:

Oops, try again. Did you add an if statement to your code?

Here page: http://ift.tt/1SCrgN8, it's in Code Your Own Adventure! 5.