LoadScene not working on Build

I have an “Exit to Menu” button on my pause screen to load the main menu. When I am in the Unity editor and testing the game, the script works fine. However, whenever I build the game, clicking the “Exit to Menu” button just closes the application.

I have both scenes included in the build (it starts on the main menu screen and clicking the play button brings up my main game scene, so I am positive both scenes are included). Does anyone have any idea what might be causing this issue? I have my code below. In the editor, I filled out public string “sceneName” as Main Menu, the name of the main menu scene.

`using System.Collections;

using System.Collections.Generic;

using UnityEngine;

using UnityEngine.EventSystems;

using UnityEngine.SceneManagement;

public class LoadScene : MonoBehaviour

{

public string sceneName;

void Start()
{

}

void Update()
{

    if (EventSystem.current.IsPointerOverGameObject())
    {

        if (Input.GetMouseButtonUp(0))
        {

            SceneManager.LoadScene(sceneName);
        }
    }
}

}`

Thank you for your help!

Try LoadSceneAsync();