StackOverflowException problem

Hi, so I get this StackOverflowException error when trying to change graphics settings in main menu, the options also don't seem to be applied as in game mode there are no shadows when there should be. I've been looking at other posts for hours and seem to know what the issue is but cannot find what in my scrip is causing this.

The code:

using System; using System.Collections.Generic; using UnityEngine; using UnityEngine.Audio; using UnityEngine.UI; using UnityEngine.SceneManagement;

public class SettingsMenu : MonoBehaviour {

 public AudioMixer mixer;
 public Dropdown resolutionDropdown;
 public Dropdown qualityDropdown;
 public Dropdown textureDropdown;
 public Dropdown aaDropdown;
 public Slider volumeSlider;
 public Slider slider;
 Resolution[] resolutions;

 // Start is called before the first frame update
 void Start()
 {

     resolutionDropdown.ClearOptions();
     List<string> options = new List<string>();
     resolutions = Screen.resolutions;
     int currentResolutionIndex = 0;


     for (int i = 0; i < resolutions.Length; i++)
     {
         string option = resolutions[i].width + " x " +
                  resolutions[i].height;
         options.Add(option);
         if (resolutions[i].width == Screen.currentResolution.width
               && resolutions[i].height == Screen.currentResolution.height)
             currentResolutionIndex = i;
     }

     resolutionDropdown.AddOptions(options);
     resolutionDropdown.RefreshShownValue();
     LoadSettings(currentResolutionIndex);

     
 }

 public void SetLevel(float sliderValue)
 {
     mixer.SetFloat("MasterVol", Mathf.Log10(sliderValue) * 20);
     PlayerPrefs.SetFloat("MasterVolume", sliderValue);
 }
 public void SetFullscreen(bool isFullscreen)
 {
     Screen.fullScreen = isFullscreen;
 }
 public void SetResolution(int resolutionIndex)
 {
     Resolution resolution = resolutions[resolutionIndex];
     Screen.SetResolution(resolution.width,
               resolution.height, Screen.fullScreen);
 }
 public void SetTextureQuality(int textureIndex)
 {
     QualitySettings.masterTextureLimit = textureIndex;
     qualityDropdown.value = 6;
 }
 public void SetAntiAliasing(int aaIndex)
 {
     QualitySettings.antiAliasing = aaIndex;
     qualityDropdown.value = 6;
 }
 public void SetQuality(int qualityIndex)
 {
     if (qualityIndex != 5) // if the user is not using 
                            //any of the presets
         QualitySettings.SetQualityLevel(qualityIndex);
     switch (qualityIndex)
     {
         case 1: // quality level - low
             textureDropdown.value = 2;
             aaDropdown.value = 0;
             break;
         case 2: // quality level - medium
             textureDropdown.value = 1;
             aaDropdown.value = 0;
             break;
         case 3: // quality level - high
             textureDropdown.value = 0;
             aaDropdown.value = 0;
             break;
         case 4: // quality level - ultra
             textureDropdown.value = 0;
             aaDropdown.value = 2;
             break;
     }

     qualityDropdown.value = qualityIndex;
 }

 public void ExitGame()
 {
     Application.Quit();
 }
 public void SaveSettings()
 {
     PlayerPrefs.SetInt("QualitySettingPreference",
                qualityDropdown.value);
     PlayerPrefs.SetInt("ResolutionPreference",
                resolutionDropdown.value);
     PlayerPrefs.SetInt("TextureQualityPreference",
        textureDropdown.value);
     PlayerPrefs.SetInt("AntiAliasingPreference",
                aaDropdown.value);
     PlayerPrefs.SetInt("FullscreenPreference",
                Convert.ToInt32(Screen.fullScreen));
     PlayerPrefs.GetFloat("MasterVolume",
                slider.value);
 }
 public void LoadSettings(int currentResolutionIndex)
 {
     if (PlayerPrefs.HasKey("QualitySettingPreference"))
         qualityDropdown.value =
                      PlayerPrefs.GetInt("QualitySettingPreference");
     else
         qualityDropdown.value = 3;
     if (PlayerPrefs.HasKey("ResolutionPreference"))
         resolutionDropdown.value =
                      PlayerPrefs.GetInt("ResolutionPreference");
     else
         resolutionDropdown.value = currentResolutionIndex;
     if (PlayerPrefs.HasKey("TextureQualityPreference"))
         textureDropdown.value =
                      PlayerPrefs.GetInt("TextureQualityPreference");
     else
         textureDropdown.value = 0;
     if (PlayerPrefs.HasKey("AntiAliasingPreference"))
         aaDropdown.value =
                      PlayerPrefs.GetInt("AntiAliasingPreference");
     else
         aaDropdown.value = 1;
     if (PlayerPrefs.HasKey("FullscreenPreference"))
         Screen.fullScreen =
         Convert.ToBoolean(PlayerPrefs.GetInt("FullscreenPreference"));
     else
         Screen.fullScreen = true;
     if (PlayerPrefs.HasKey("VolumePreference"))
         volumeSlider.value =
                     PlayerPrefs.GetFloat("VolumePreference");
     else
         volumeSlider.value =
                     PlayerPrefs.GetFloat("VolumePreference");
 }

 // Load game scene
 public void GameScene()
 {
     SceneManager.LoadScene("Game");
 }

}