SceneManager.GetActiveScene() returns "does not exist in current context"

Unity Engine
1

I am using SceneManager.GetActiveScene() in Unity 2019.1.0f2 Personal and I cannot use SceneManager.GetActiveScene() within a SceneManager.load.
The code is this:

using UnityEngine;
using UnityEngine.SceneManagement;

public class GameManager : MonoBehaviour
{

    bool gameHasEnded = false;
    public void EndGame()
    {
        if (gameHasEnded == false)
        {
            gameHasEnded = true;
            Debug.Log("GAME OVER");
            Restart();
        }
      
    }
    void Restart ()
    {
        SceneManager.LoadScene(SceneManager.GetActiveScene().name);
    }
}
2

The solution was to change GetActiveScene().name to GetActiveScene().buildindex.