NullPointerException when trying to read data

I am getting the exception below when trying to read data from charactertistic

    java.lang.NullPointerException: value must not be null
        at com.juul.kable.gatt.Callback.onCharacteristicRead(Callback.kt:110)
        at android.bluetooth.BluetoothGatt$1$6.run(BluetoothGatt.java:394)
        at android.os.Handler.handleCallback(Handler.java:883)
        at android.os.Handler.dispatchMessage(Handler.java:100)
        at android.os.Looper.loop(Looper.java:214)
        at android.os.HandlerThread.run(HandlerThread.java:67)

This is my code from ModelView

    init {
        val TAG = "HomeViewModel"
            val _deviceId = "A8:7E:EA:71:89:54" // Emulator
//        val _deviceId = "B4:52:A9:04:E2:88" // Oximeter
        viewModelScope.launch {
            val adapter = BluetoothAdapter.getDefaultAdapter()
            val btd = adapter.getRemoteDevice(_deviceId)
            val peripheral = peripheral(btd)
            Timber.tag(TAG).d("Connecting to device")
            peripheral.connect()
            Timber.tag(TAG).d("Connected to device")
            delay(2000)

            val ch = characteristicOf("0000180A-0000-1000-8000-00805F9B34FB", "00002a29-0000-1000-8000-00805f9b34fb")
            val data = peripheral.read(ch)
            Timber.tag(TAG).d("Manufacturer data $data")
        }
    }

[francismariano]

I think GATT_AUTH_FAIL status depends on user interaction when it accept the pairing request and typing the correct PIN. So, it is ok the consumer of the library handle it.

[twyatt]

Fixed (to throw the appropriate exception) in 0.5.0.