Kotlin NullPointerException问题

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我正在使用Google Map开发应用程序，但是权限有问题。有人可以帮我吗？尽管Android 10没问题，但Android 9却有此问题。 这些106-115行的代码

if (ContextCompat.checkSelfPermission(this,android.Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED){
            requestPermissions(arrayOf(android.Manifest.permission.ACCESS_FINE_LOCATION),1)

        }else{
            locationManager!!.requestLocationUpdates(LocationManager.GPS_PROVIDER,2,2f,locationListener)
            mMap.clear()
            var lastLocation = locationManager!!.getLastKnownLocation(LocationManager.GPS_PROVIDER)
            var lastUserLocation = LatLng(lastLocation!!.latitude,lastLocation!!.longitude)
            mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(lastUserLocation,17f))
        }

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