Issues with tumbling cube script

Hi everyone, I'm trying to make a game, I need my cube to move on the play area tumbling so I found a nice script that at first look was working properly. The problem comes when the cube has to stop against a wall or another collider because it first gets stuck and then it is thrown away losing it's position.
Can you help me solving that? Here's the code :

using System.Collections;

using UnityEngine;



public class PlayerController : MonoBehaviour

{



    public float tumblingDuration = 0.2f;









    void Update ()

    {

        var dir = Vector3.zero;



        if (Input.GetKey(KeyCode.UpArrow))

            dir = Vector3.forward;



        if (Input.GetKey(KeyCode.DownArrow))

            dir = Vector3.back;



        if (Input.GetKey(KeyCode.LeftArrow))

            dir = Vector3.left;



        if (Input.GetKey(KeyCode.RightArrow))

            dir = Vector3.right;



        if (dir != Vector3.zero && !isTumbling)

        {

            StartCoroutine(Tumble(dir));

        }

    }



    bool isTumbling = false;

    IEnumerator Tumble(Vector3 direction)

    {

        isTumbling = true;



        var rotAxis = Vector3.Cross(Vector3.up, direction);

        var pivot = (transform.position + Vector3.down*0.5f ) + direction*0.5f;



        var startRotation = transform.rotation;

        var endRotation   = Quaternion.AngleAxis(90.0f, rotAxis)*startRotation;



        var startPosition = transform.position;

        var endPosition   = transform.position + direction;



        var rotSpeed = 90.0f/tumblingDuration;

        var t = 0.0f;



        while ( t < tumblingDuration )

        {

            t += Time.deltaTime;

            transform.RotateAround(pivot, rotAxis, rotSpeed * Time.deltaTime);

            yield return null;

        }



        transform.rotation = endRotation;

        transform.position = endPosition;



        isTumbling = false;

    }

}

I think it could be solved by using a rigidbody component and modifying a few lines but I'm not really confident with this kind of movement.