Firebase realtime database with await function in kotlin

Question

I have a trouble using firebase realtime database, I found the reason. I'm using await function when get the data. When network is offline, it throws an error and app is closing. Can you give me the reason? I have to return this result for use it at the another space that I have to use await function for get the result. Thanks for reading. here is my code below.

    lateinit var database: DatabaseReference
    database = Firebase.database.reference

    val test: DataSnapshot? = database.child("issuers").child(issuerguid).child("test").get().await()

Answer 1

try this

fun test(action :(snapShot :DataSnapshot) -> Unit){ 
  database.child("issuers").child(issuerguid).child("test").get()
  .addOnSuccessListener{ snapshot -> 
  action(snapShot)
  }
}

 //usage
 test{
 //use snapshot here
 }