Highscore not working

Hello,

I am making a 2d catch game where you have to catch falling objects. I am trying to make a HighScore system, but I am really stuck right now..

This is my score script:

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

public class Score : MonoBehaviour {

 public static Score HS;
 public Text scoreText;
 public Text HighScore;
 public int krolschValue;
 private int score;
 int highScore;

 void start () {
     HS = this;
     score = 0;
     UpdateScore ();
     highScore = PlayerPrefs.GetInt("HighScore1",0);
 }
 void OnTriggerEnter2D () {
     score += krolschValue;
     UpdateScore ();
 }
 void UpdateScore () {
     scoreText.text = "X " + score;
     HighScore.text = "HighScore: " + highScore;
 }
 public void CheckHighScore()
 {
     if(score > highScore)
     {
         Debug.Log ("Saving Score");
         PlayerPrefs.SetInt("HighScore1",score);
     }
 }

}

And this is my LifeManager script (where I am using the function of when I am out of lifes, in the void Update):

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

public class LifeManager : MonoBehaviour {

 public int startingLives;
 private int lifeCounter;

 private Text theText;

 public GameObject GameOverScreen;

 public GameManager Spawner;


 // Use this for initialization
 void Start () {
     theText = GetComponent<Text>();

     lifeCounter = startingLives;

     Spawner = FindObjectOfType<GameManager>();
 }
 
 // Update is called once per frame
 void Update () {
     if(lifeCounter <= 0)
     {
         GameOverScreen.SetActive(true);
         Spawner.gameObject.SetActive(false);
         Score.HS.CheckHighScore();
     }

     theText.text = "X " + lifeCounter; 
 }

 public void GiveLife()
 {
     lifeCounter++;
 }

 public void TakeLife()
 {
     lifeCounter--;
 }

}

My score is working perfectly, but when I am out of lifes and the GameOver GUI comes over, where the HighScore text is, it always just shows 0.

Please help

Bram