3rd person character controller rotation keeps resetting to 0

My 3rd person character controller keeps forcing the players Y rotation transform to zero when I am not moving them/when there is no movement input. my console is also spammed with..

"Look rotation viewing vector is zero UnityEngine.Quaternion:LookRotation (UnityEngine.Vector3,UnityEngine.Vector3) PlayerController:Update () (at Assets/Scripts/PlayerController.cs:25 "

This is the script I am working with as well as the video for reference...

using System.Collections; using System.Collections.Generic; using UnityEngine; public class PlayerController : MonoBehaviour

{

 public float moveSpeed = 5.0f;

 public float rotationSpeed = 280.0f;

 public bool idleRotate = false;

 float horizontal;

 float vertical;

 private void Update()
 {
     Vector3 moveDirection = Vector3.forward * vertical + Vector3.right * horizontal; 

     Vector3 projectedCameraForward = Vector3.ProjectOnPlane(Camera.main.transform.forward, Vector3.up);
     Quaternion rotationToCamera = Quaternion.LookRotation(projectedCameraForward, Vector3.up);

  //"shooter controller" transform.rotation = Quaternion.RotateTowards(transform.rotation, rotationToCamera, rotationSpeed * Time.deltaTime);

     moveDirection = rotationToCamera * moveDirection;
     Quaternion rotationToMoveDirection = Quaternion.LookRotation(moveDirection, Vector3.up);

   
  //"shooter controller" transform.rotation = Quaternion.RotateTowards(transform.rotation, rotationToCamera, rotationSpeed * Time.deltaTime);

     transform.rotation = Quaternion.RotateTowards(transform.rotation, rotationToMoveDirection, rotationSpeed * Time.deltaTime);
    
     transform.position += moveDirection * moveSpeed * Time.deltaTime;
 }


 public void OnMoveInput(float horizontal, float vertical)
 {
     this.vertical = vertical;
     this.horizontal = horizontal;
     //Debug.Log($"Player Controller: Move Input: {vertical}, {horizontal} ");

 }

}

link:Video tutorial referenced above

I have been trying to figure it out for a bit, but I am still learning the ropes for coding and could use the help. Much appreciated!