问不安全地使用可为空的接收器类型捆绑？android应用程序将编译并显示警告，但会立即崩溃

EN

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_main)

    cameraButton.setOnClickListener {
        val callCameraIntent = Intent(MediaStore.ACTION_IMAGE_CAPTURE)
        if(callCameraIntent.resolveActivity(packageManager) != null) {
            startActivityForResult(callCameraIntent, CAMERA_REQUEST_CODE)
        }
    }

    replaceFragment(ReportsFragment())
    bottom_navigation.setOnNavigationItemSelectedListener(mOnNavigationItemSelectedListener)


}

override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
    super.onActivityResult(requestCode, resultCode, data)

    val dt: Intent? = data

    when(requestCode) {
        CAMERA_REQUEST_CODE -> {
            if(resultCode == Activity.RESULT_OK && data != null) {
            //if(data != null) {
                //&& data != null){
                photoImageView.setImageBitmap(data.extras.get("data") as Bitmap)
            }
        }
        else -> {
            Toast.makeText(this, "Unrecognized request code", Toast.LENGTH_SHORT).show()
        }
    }
}