<Kotlin firebase executed with addOnSuccessListene...

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Kotlin firebase executed with addOnSuccessListener even if fails
I have this piece of code and it is executed with .continueWith and addOnSuccessListener even if failed.I try with continueWithTask but i dont understand very well Tasks API. Please help me to understand how to do this.
db.collection(customGameName).document().get().continueWith {
if (!gameslist.contains(customGameName)) {
gameslist.add(customGameName)
SavedPreference.setGamesList(this, gameslist)
adapter.notifyDataSetChanged()
}else{...