Feedback [HELP!!] NullReferenceException when trying to use a bool from another script in an if statment

Error when I left click:
"NullReferenceException: Object reference not set to an instance of an object
SwordManager.OnTriggerEnter (UnityEngine.Collider other) (at Assets/Scripts/Weapons/SwordManager.cs:26)"
(In the posted code the error line is 27)


In PlayerManager I set a bool, leftClick to true when I left click, then after 5 seconds I set it to false.
In SwordManager, I am trying to make it so when the sword collides with the enemy (onTrigger) AND the player has left clicked (leftCick is true), then the enemy takes damage.

Code (CSharp):

1.  
2. using System.Collections;
3. using System.Collections.Generic;
4. using UnityEngine;
5.  
6. public class SwordManager : MonoBehaviour
7. {
8.     private PlayerManager player;
9.  
10.     // Start is called before the first frame update
11.     void Start()
12.     {
13.    
14.     }
15.  
16.     // Update is called once per frame
17.     void Update()
18.     {
19.    
20.     }
21.     private void OnTriggerEnter(Collider other)
22.     {
23.         GameObject objectCollided = other.gameObject;
24.         if (other.gameObject.tag == "enemy")
25.         {
26.             //Debug.Log("Collision with sword!");
27.             if (player.leftClick == true)
28.             {
29.                 objectCollided.GetComponent<EnemyManager>().ChangeEnergy(-5);
30.             }
31.        
32.         }
33.     }
34.  

Code (CSharp):

1.  
2. using System.Collections;
3. using System.Collections.Generic;
4. using UnityEngine;
5. using UnityEngine.UI;
6. using UnityEngine.AI;
7.  
8. public class PlayerManager : MonoBehaviour
9. {
10.     public static PlayerManager instance; //singleton
11.     public GameObject player;
12.     public PlayerMovementManager movementManager;
13.     private EnemyManager enemy;
14.     private SwordManager sword;
15.     public Animator anim;
16.     public bool leftClick = false;
17.  
18.     //Health Variables
19.     [SerializeField] private float currentEnergy;
20.     [SerializeField] private float maxEnergy;
21.     public Image EnergyBar;
22.  
23.     //Cheats
24.     private bool invincible = false;
25.  
26.     private void Awake()
27.     {
28.         anim = GetComponent<Animator>();
29.  
30.         // Has the singleton not been created yet
31.         if (instance == null)
32.         {
33.             instance = this;
34.             DontDestroyOnLoad(gameObject);
35.         }
36.         else
37.         {
38.             Destroy(gameObject);
39.         }
40.     }
41.     void Start()
42.     {
43.         movementManager = GetComponent<PlayerMovementManager>();
44.         currentEnergy = 100f;
45.         EnergyBar.fillAmount = 1;
46.     }
47.  
48.     void Update()
49.     {
50.         CheckInvincibility();
51.         PerformAttack();
52.    
53.     }
54.  
55.     void FixedUpdate()
56.     {
57.        //Debug.Log("Able to attack: " + leftClick);
58.     }
59.  
60.     //Methods
61.     void PerformAttack()
62.     {
63.         if (Input.GetMouseButton(0))
64.         {
65.             anim.SetInteger(HashIDs.slashCond_Int, 1);
66.             leftClick = true;
67.             Invoke("DisableAttack", 5f);
68.         }
69.         else
70.         {
71.             anim.SetInteger(HashIDs.slashCond_Int, 0);
72.         }
73.     }
74.  
75.     void DisableAttack()
76.     {
77.         leftClick = false;
78.     }
79. }
80.  

 

The way you have your code setup, in SwordManager, line 27, you'll want reference PlayerManager.instance

Code (CSharp):

1. if (PlayerManager.instance.leftClick == true)