Record Collection-cant figure out whats wrong even after youtube video

Tell us what’s happening:
Hello can anyone have a look at my code and tell whats wrong with it because I cant pass the challenge. I kept getting the message:

"updateRecords(…)[5439].tracks.pop is not a function

updateRecords(…)[1245].tracks.pop is not a function

After updateRecords(2468, “tracks”, “Free”), tracks should have “1999” as the first element."

Your code so far


// Setup
var collection = {
    "2548": {
      "album": "Slippery When Wet",
      "artist": "Bon Jovi",
      "tracks": [ 
        "Let It Rock", 
        "You Give Love a Bad Name" 
      ]
    },
    "2468": {
      "album": "1999",
      "artist": "Prince",
      "tracks": [ 
        "1999", 
        "Little Red Corvette" 
      ]
    },
    "1245": {
      "artist": "Robert Palmer",
      "tracks": [ ]
    },
    "5439": {
      "album": "ABBA Gold"
    }
};
// Keep a copy of the collection for tests
var collectionCopy = JSON.parse(JSON.stringify(collection));

// Only change code below this line

function updateRecords(id, prop, value) {
 if (value === "") {
   delete collection[id][prop];

 } else if (prop === "track"){
   collection[id][prop] = collection[id][prop] || [];
   collection[id][prop].push(value);
   
 } else {

   collection[id][prop] = value;
 }
  
  return collection;
}

// Alter values below to test your code
console.log(updateRecords(5439, "tracks", "Take a Chance on Me"));

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.142 Safari/537.36.

Link to the challenge:
https://learn.freecodecamp.org/javascript-algorithms-and-data-structures/basic-javascript/record-collection

} else if (prop === "track"){

should be

} else if (prop === "tracks"){
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