How to avoid randomizing image from array which is in image_view?

If I do this, it sometimes sets the same image as it was in image_view. For example, if R.drawable.cat__5_ is in image_view I want to select from R.drawable.cat__3_,R.drawable.cat__4_,R.drawable.cat__6_,R.drawable.cat__7_,R.drawable.cat__8_. How it can be done?

 var cats = intArrayOf(
                R.drawable.cat__3_,
                R.drawable.cat__4_,
                R.drawable.cat__5_,
                R.drawable.cat__6_,
                R.drawable.cat__7_,
                R.drawable.cat__8_)

    button.setOnClickListener{
    random = Random()
    image_view.setImageResource(cats[random.nextInt(cats.size)])