you are looking for an array that is empty. But this doesn’t exist - the collection either has a tracks property with an array of track names, or the track property doesn’t exist. This means the code in these curly brackets never executes.
and this code resets the tracks property to empty, which erases all track names already stored.
The instructions say: If the prop === “tracks” the instructions say you need to either create an empty array if the album doesn’t have a tracks property before adding the new value OR push the value onto the existing tracks arrays. Your code is currently always creating an empty array and then adding the new value, so check the if statement I quoted above and see if you can fix it to push the value onto the existing tracks array.