StackOverFlowException: The requested operation caused a stack overflow

Questions & Answers
1

Hello.
I am making a game, and I am getting this error:
StackOverFlowException: The requested operation caused a stack overflow

This is my code I think is causing the problem:

    private IEnumerator SpawnWallJumpParticle()
    {
        if (IsWallJumping)
        {
            Instantiate(WallJumpParticle, transform.position, Quaternion.identity);
            yield return new WaitForSeconds(0.3f);
        }
        yield return StartCoroutine(SpawnWallJumpParticle());
    }

This is the full code:

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class PlayerController : MonoBehaviour
{
    private CharacterController Controller;
    public float Speed = 12f;
    public Vector3 Velocity;
    public float Gravity = -9.81f;
    public float JumpHight = 3f;
    public bool IsWallJumping;
    private Rigidbody Rigidbody;
    public float thrustForward = 1.0f;
    public float thrustUp = 1f;
    private bool IsGrounded;
    public bool IsCutScene;
    public ParticleSystem WallJumpParticle;
    void Start()
    {
        StartCoroutine(SpawnWallJumpParticle());
        Controller = GetComponent<CharacterController>();
        Rigidbody = gameObject.GetComponent<Rigidbody>();
        if (IsCutScene)
        {
            gameObject.GetComponent<Animator>().enabled = true;
        }
    }

    // Update is called once per frame
    void Update()
    {
        if (IsCutScene == false)
        {
            float x = Input.GetAxis("Horizontal");
            float z = Input.GetAxis("Vertical");
            Vector3 Move = transform.right * x + transform.forward * z;
            Controller.Move(Move * Speed * Time.deltaTime);
            StartCoroutine(WallJump());
            if (Input.GetKey(KeyCode.Space))
            {
                Jump();
            }
            if (Input.GetKey(KeyCode.LeftShift))
            {
                transform.localScale = new Vector3(1, 0.7f, 1);
                Controller.height = 3.8f / 2;
            }
            else
            {
                transform.localScale = new Vector3(1, 1, 1);
                Controller.height = 3.8f;
            }
        }
        Velocity.y += Gravity * Time.deltaTime;
        Controller.Move(Velocity * Time.deltaTime);
        if ((Controller.collisionFlags & CollisionFlags.Below) != 0)
        {
            IsGrounded = true;
            Velocity.y = -2f;
        }
        else
        {
            IsGrounded = false;
        }
    }
    private void Jump()
    {
        if (IsGrounded)
        { 
            Velocity.y = Mathf.Sqrt(JumpHight * -2f * Gravity);
        }
    }
    private IEnumerator WallJump()
    {
        if ((Controller.collisionFlags & CollisionFlags.Sides) != 0)
        {
            IsWallJumping = true;
            Gravity = 0;
            Rigidbody.AddForce(transform.forward * thrustForward);
            Rigidbody.AddForce(transform.up * thrustUp);
            Velocity = new Vector3(0,5,0);
            yield return new WaitForSeconds(1f);
            Velocity = new Vector3(0,-2f, 0);
        }
        else
        {
            IsWallJumping = false;
            Gravity = -9.81f;
        }
    }
    private IEnumerator SpawnWallJumpParticle()
    {
        if (IsWallJumping)
        {
            Instantiate(WallJumpParticle, transform.position, Quaternion.identity);
            yield return new WaitForSeconds(0.3f);
        }
        yield return StartCoroutine(SpawnWallJumpParticle());
    }
}
2

I believe that this part is causing an infinite loop because you always call it:

yield return StartCoroutine(SpawnWallJumpParticle());

I may be wrong, but that is what it seems like to me.
I suggest you find a way to not call the entire function in the Start method to check if that is the problem.