UI element bug?

I assign the text element in the inspector as shown.

However, when I run the game, the inspector looks like this.

I get a “NullReferenceExecption: Object Reference not set to an instance of an object”. Below is the code I am using.

using UnityEngine;
using System.Collections;
using UnityEngine.UI;

public class ScoreKeeper : MonoBehaviour {

	public Text scoreText;
	public static int score;

	// Use this for initialization
	void Start () {
		scoreText = gameObject.GetComponent<Text> ();
		score = 0;
	// Update is called once per frame
	void Update () {
		scoreText.text = "Score: " + score.ToString();

This is no bug. The reason you are getting an error is that you are first assigning the UI.Text element in the inspector but then you nullifying it in the Start() function with this

scoreText = gameObject.GetComponent<Text> ();

you can either remove the statement above or do this instead

if (scoreText == null)
    scoreText = gameObject.GetComponent<Text> ();

Note: The assignment requires that a UI.Text component be attached to the current game object (the same game object that ScoreKeeper is attached to).