Javascript: Delete an object with a array within a object

Dear Stackoverflow friends,

I have a question, i'm busy with a NodeJS - Angular application. To save and delete parts of a form i use an object:

$scope.entries = {
  events:{
    save:{},
    del:[],
    save_count:0},

  actions:{
    save:{},
    del:[],
    save_count:0},

  packages:{
    save:{},
    del:[],
    save_count:0}
}

Now for example i have an object like this (saved in packages)

save:{
  1398944325398:{
   action: 6461,
   budget: 1000,
   events: [123, 1242],
   id: 209
   name: "Jeffrey"},
 1398949842824:{
   action: 6441,
   budget: 1020,
   events: [153, 12422],
   id: 21
   name: "Jeffrey2"}
}

So when i want to delete the key: 1398944325398 I have the following code:

delete $scope.entries.package.save['1398944325398'];

But when i send this object $scope.entries to my Node server i get this:

packages:{
 del: Array[0],
 save:{
  1398944325398:{
   events: Array[0]
  },
  1398949842824:{
   action: 6441,
   budget: 1020,
   events: [153, 12422],
   id: 21
   name: "Jeffrey2"}
 },
 save_count: 0
}

Why won't javascript delete my object if there is an array in that object? Setting the array to 'null' Won't solve the problem