Crashing and dont know why

 using UnityEngine;
 using System.Collections;
 
 public class PauseButton : MonoBehaviour {
     public Animator pauseMenu;
     public bool paused = false;
     public GameObject gamemanager;
     // Use this for initialization
     void Start () {
     
     }
     
     // Update is called once per frame
     void Update () {
         if (gamemanager.GetComponent<gamemanager>().gameOver)
         {
             pauseMenu.SetTrigger("unpause");
         }
         else if (Input.GetKeyDown(KeyCode.Escape))
         {
             if (paused)
             {
                 pauseMenu.SetTrigger("unpause");
                 paused = false;
                 unpauseObjects();
             }
             else
             {
                 pauseMenu.SetTrigger("pause");
                 paused = true;
                 pauseObjects();
             }
         }
 
     }
 
     void pauseObjects()
     {
         GameObject[] enemys = GameObject.FindGameObjectsWithTag("EnemyBlock");
         foreach (GameObject enemy in enemys)
         {
             enemy.GetComponent<Rigidbody>().isKinematic = true;
         }
     }
 
     void unpauseObjects()
     {
         GameObject[] enemys = GameObject.FindGameObjectsWithTag("EnemyBlock");
         foreach (GameObject enemy in enemys)
         {
             enemy.GetComponent<Rigidbody>().isKinematic = false;
         }
     }
 
     void OnMouseDown()
     {
         if (!paused)
         {
             pauseMenu.SetTrigger("pause");
             paused = true;
             pauseObjects();
         }
         else
         {
             pauseMenu.SetTrigger("unpause");
             paused = false;
             unpauseObjects();
         }
     }
 }
 

Not sure why but this is crashing my entire editor. Feel like i been staring at it to long so im asking yall to help me find the problem. Thanks :)