Order of Operations Matter

gistfile1.m

NSInteger assetCount = [group numberOfAssets];
if(assetCount <= 0){
  return;
}

[group setAssetsFilter:[ALAssetsFilter allPhotos]];

NSIndexSet *indexes = [NSIndexSet indexSetWithIndex:assetCount-1];

// instead of this:

[group setAssetsFilter:[ALAssetsFilter allPhotos]];
NSInteger assetCount = [group numberOfAssets];
if(assetCount <= 0){
  return;
}

NSIndexSet *indexes = [NSIndexSet indexSetWithIndex:assetCount-1];