NullReferenceException Error: Raycast Ground Check Problem

Hey guys!
I'm creating a 2D platformer game and I'm running into a NullReferenceException error.

You can look at my code below(The "!!!!" indicate the places which, I think, are related to the error):

Code (CSharp):

1. public class Player : MonoBehaviour {
2.  
3.     //movement variables
4.     [SerializeField] float speed;
5.  
6.     private bool isFacingRight;
7.  
8.     //jump variables !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
9.     [SerializeField] float jumpForce;
10.  
11.     bool isGrounded;
12.     float groundCheckRadius = 0.1f;
13.     [SerializeField] LayerMask groundLayer;
14.     [SerializeField] Transform groundCheck;
15.  
16.     //attack anim variables
17.     bool isAttacking;
18.     public GameObject attackLeaf1;
19.     public GameObject attackLeaf1inv;
20.     [SerializeField] float attack1Delay;
21.     //attack variables
22.     float hitCheckRadius = 0.3f;
23.     [SerializeField] LayerMask hitLayer;
24.     [SerializeField] Transform hitCheck;
25.  
26.     //general variables
27.     Rigidbody2D rb;
28.     Animator anim;
29.  
30.     private void Start () {
31.         rb = GetComponent<Rigidbody2D>();
32.         anim = GetComponent<Animator>();
33.  
34.         isFacingRight = true;
35.     }
36.    
37.     private void Update(){
38.         if(!isAttacking){
39.             verticalMovement();
40.             horizontalMovement();
41.             checkGround(); //!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
42.  
43.             if(Input.GetKeyDown(KeyCode.J) && isGrounded == true){
44.                 attack();
45.             }
46.         }
47.     }
48.  
49.     void attack(){
50.         isAttacking = true;
51.         anim.SetBool("isAttacking", isAttacking);
52.  
53.         Vector3 scale = transform.localScale;
54.         var attackLeaf1Scale = attackLeaf1.transform.localScale.x;
55.  
56.         if(scale.x == 1f){
57.             Instantiate(attackLeaf1, transform.position + new Vector3(0.545f, -0.024f, 0), Quaternion.identity);
58.         }if(scale.x == -1f){
59.             Instantiate(attackLeaf1inv, transform.position + new Vector3(-0.545f, -0.024f, 0), Quaternion.identity);
60.         }
61.  
62.  
63.         StartCoroutine(stopAnim(attack1Delay));
64.     }
65.  
66.     IEnumerator stopAnim(float delay){
67.         yield return new WaitForSeconds(delay);
68.  
69.         isAttacking = false;
70.         anim.SetBool("isAttacking", isAttacking);
71.     }
72.  
73.     void horizontalMovement(){
74.         float horizontalInput = Input.GetAxis("Horizontal");
75.  
76.         transform.Translate(Vector2.right * horizontalInput * speed * Time.deltaTime);
77.  
78.         if (horizontalInput > 0 && !isFacingRight)
79.         {
80.             flip();
81.         }
82.         else if (horizontalInput < 0 && isFacingRight)
83.         {
84.             flip();
85.         }
86.  
87.         anim.SetFloat("speed", Mathf.Abs(horizontalInput));
88.     }
89.  
90.     //!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
91.     void checkGround(){
92.  
93.         RaycastHit2D hit = Physics2D.Raycast(groundCheck.position, -Vector3.up, 0.1f);
94.  
95.         if(hit.collider.gameObject.layer == LayerMask.NameToLayer("Ground")){  //IT SAYS THE PROBLEM IS HERE!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
96.             isGrounded = true;
97.  
98.             anim.SetBool("isGrounded", isGrounded);
99.  
100.             anim.SetFloat("verticalSpeed", rb.velocity.y);
101.         }
102.  
103.         Vector3 endLine = groundCheck.position - new Vector3(0, -0.1f, 0);
104.  
105.         Debug.DrawLine(groundCheck.position, endLine, Color.green, 1, true);
106.     }
107.  
108.     void verticalMovement(){
109.         float verticalInput = Input.GetAxis("Jump");
110.  
111.         if(isGrounded && verticalInput>0){
112.             isGrounded = false;
113.             anim.SetBool("isGrounded", isGrounded);
114.  
115.             transform.Translate(Vector2.up * verticalInput * jumpForce * Time.deltaTime);
116.             rb.AddForce(Vector2.up * jumpForce, ForceMode2D.Impulse);
117.         }
118.     }
119.  
120.     void flip(){
121.         isFacingRight = !isFacingRight;
122.         Vector3 scale = transform.localScale;//setting "scale" equal to the current scale of the object.
123.  
124.         scale.x *= -1f;
125.  
126.         transform.localScale = scale;
127.     }
128. }
129.  

Here are the things I've defined in the inspector.


The error isn't really affecting the game but when my character jumps, the following error comes up during the time the character's in the air:


Help would be greatly appreciated! Thank you!

 

Did you look at the reference docs for the function here:

https://docs.unity3d.com/ScriptReference/Physics2D.Raycast.html

Specifically, and I quote:

"This function returns a RaycastHit2D object with a reference to the collider that is hit by the ray (the collider property of the result will be NULL if nothing was hit)."

Is that what is happening?

 

Next time please also put your "using" tags in there too, i looked at the error and went to look at line 100,

Code (CSharp):

1. anim.SetFloat("verticalSpeed", rb.velocity.y);
2.  

in your "if" check to see that "hit" isn't null before testing for "hit.whatever".

*So happy the 3D version returns a bool right now, haha.

 

This is likely the problem, given how short the raycasts are set to be. You need to null check the RaycastHit2D's collider before accessing it.

if(hit.collider != null && hit.collider.gameObject.layer == LayerMask.NameToLayer("Ground"))

 

Thank you guys for responding.
I tested it and, yes, that was the problem. I needed to add the "hit.collider != null" parameter to the ground check.
@WallaceT_MFM Sorry about not adding the full script, I haven't really used the unity forums much and it didn't occur to me to do so.