Question by Bestej21 · Dec 29, 2019 at 01:29 AM · c#error spawn

i am trying to stop spawning when the game is over

I don't know what is wrong with it any help would be great!! what is below is my code

 public class GameManagerX : MonoBehaviour
 {
     public TextMeshProUGUI scoreText;
     private int score;
     public TextMeshProUGUI gameOverText;
     public GameObject titleScreen;
     public Button restartButton;
 
     public List<GameObject> targetPrefabs;
 
 
     private float spawnRate = 1.5f;
     public bool isGameActive;
 
     private float spaceBetweenSquares = 2.5f;
     private float minValueX = -3.75f; //  x value of the center of the left-most square
     private float minValueY = -3.75f; //  y value of the center of the bottom-most square
 
 
     // start is called before the first frame update
     void Start()
     {
         StartCoroutine(SpawnTarget());
         score = 0;
         UpdateScore(0);
 
     }
     // Start the game, remove title screen, reset score, and adjust spawnRate based on difficulty button clicked
     public void StartGame()
     {
         spawnRate /= 5;
         isGameActive = true;
         StartCoroutine(SpawnTarget());
         score = 0;
         scoreText.text = "Score: " + score;
         UpdateScore(0);
         titleScreen.SetActive(false);
 
     }
 
     // While game is active spawn a random target
     IEnumerator SpawnTarget()
     {
         while (isGameActive)
         {
             yield return new WaitForSeconds(spawnRate);
             int index = Random.Range(0, targetPrefabs.Count);
 
 
             if (isGameActive)
             {
                 Instantiate(targetPrefabs[index], RandomSpawnPosition(), targetPrefabs[index].transform.rotation);
             }
 
         }
     }
 
     // Generate a random spawn position based on a random index from 0 to 3
     Vector3 RandomSpawnPosition()
     {
         float spawnPosX = minValueX + (RandomSquareIndex() * spaceBetweenSquares);
         float spawnPosY = minValueY + (RandomSquareIndex() * spaceBetweenSquares);
 
         Vector3 spawnPosition = new Vector3(spawnPosX, spawnPosY, 0);
         return spawnPosition;
 
     }
 
     // Generates random square index from 0 to 3, which determines which square the target will appear in
     int RandomSquareIndex()
     {
         return Random.Range(0, 4);
     }
 
     // Update score with value from target clicked
     public void UpdateScore(int scoreToAdd)
     {
         score += scoreToAdd;
         scoreText.text = "Score: " + score;
     }
 
     // Stop game, bring up game over text and restart button
     public void GameOver()
     {
         gameOverText.gameObject.SetActive(true);
         restartButton.gameObject.SetActive(true);
         isGameActive = false;
     }
 
     // Restart game by reloading the scene
     public void RestartGame()
     {
         SceneManager.LoadScene(SceneManager.GetActiveScene().name);
     }
     private float timer = 60;
     public TextMeshProUGUI textTimer;
 
     private void Update()
     {
         if (isGameActive)
         {
 
             CountdownTimer();
         }
 
         if (timer < 0)
         {
             GameOver();
         }
     }
 
     public void CountdownTimer()
     {
         timer -= Time.deltaTime;
         textTimer.SetText("Time: " + Mathf.Round(timer));
 
     }

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