<Android Kotlin Fragments: ''Attempt to invoke vir...

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[user]

Android Kotlin Fragments: ''Attempt to invoke virtual method on a null object reference''
My code in MainActivity:
val buttonbckbrowse = findViewById(R.id.buttonbck)
buttonbckbrowse.setOnClickListener {
val webView = findViewById(R.id.webViewBrowse)
webView.goBack()
Toast.makeText(baseContext, "Back", Toast.LENGTH_SHORT).show()
}

buttonbck is in a different fragment.
When trying to run my app I get ''Exception: Attempt to invoke virtual method 'void android.widget.Button.setOnClickListener(android.view.View$OnClickListener)' on a null object...