<app crashed when i click on ImageView placeholder...

# stackoverflow

[user]

app crashed when i click on ImageView placeholder
i just write a code to get permissions to READ_EXTERNAL_STORAGE when i click on an ImageView. All of things going fine but i run the app and clicked on ImageView then the app got crashed.
here is my code:
in OnCreate:
var iv_user_image:ImageView = findViewById(R.id.iv_user_image)
iv_user_image.setOnClickListener(this@UserProfileActivity)

my methods:
override fun onClick(view: View?) {


if (view != null){
when (view.id){...