Confused on the Record Collection challange

I don’t get why I keep getting undefined on tracks?

// Setup
var recordCollection = {
  2548: {
    albumTitle: 'Slippery When Wet',
    artist: 'Bon Jovi',
    tracks: ['Let It Rock', 'You Give Love a Bad Name']
  },
  2468: {
    albumTitle: '1999',
    artist: 'Prince',
    tracks: ['1999', 'Little Red Corvette']
  },
  1245: {
    artist: 'Robert Palmer',
    tracks: []
  },
  5439: {
    albumTitle: 'ABBA Gold'
  }
};

// Only change code below this line
function updateRecords(records, id, prop, value) {
 // Prop = artist or tracks
 if (prop !== tracks && value !== '' ) { 
  records[prop] = value
 }
  return records
}

updateRecords(recordCollection, 5439, 'artist', 'ABBA');

tracks and "tracks" are different.

tracks is an undeclared variable.

"tracks" is a string.

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