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Can any one help my?

when i playing the game randomly this error appear and the score disappear and say NaN


the movement script



using UnityEngine;


public class playermovement3D : MonoBehaviour {


  public Rigidbody rb;


  public float forwdforce = 2000f;

  public float sidewayforce = 500f;


// Update is called once per frame

void FixedUpdate ()

  {

    rb.AddForce(0, 0, forwdforce * Time.deltaTime);


    if ( Input.GetKey("d") )

    {

      rb.AddForce(sidewayforce * Time.deltaTime, 0, 0, ForceMode.VelocityChange);

    }

    if (Input.GetKey("a"))

    {

      rb.AddForce(-sidewayforce * Time.deltaTime, 0, 0, ForceMode.VelocityChange);

    }

    if (rb.position.y < -1f)

    {

      FindObjectOfType<GameManager>().EndGame();

    }

     

  }

}

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