Question i can't launch my game in webgl

Hi unity community,when i try my unity game in my bowser it shows this message:

An error occurred running the unity content on this
page.see your browser javascript console for more info
the error was:abort(165) at error

and after that when it changes the scene,the screen of my game just got freeze,
looking in my unity project of the game in the console it shows this message:
NullReferenceException: Object reference not set to an instance of an object
Player.UpdateCharacter (System.Int32 selectedOption) (at Assets/Scripts/Player.cs:43)
Player.Start () (at Assets/Scripts/Player.cs:24)

i think the problem is in the player,more specific the player script i use for the character when it moves
here is the script i use for my character:

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

public class Player : MonoBehaviour
{
public float playerSpeed;
private Rigidbody2D rb;
private Vector2 playerDirection;

public CharacterDatabase characterDB;
public Text nameText;
public SpriteRenderer artworkSprite;

private int selectedOption = 0;

// Start is called before the first frame update
void Start()
{
rb = GetComponent<Rigidbody2D>();
LoadSelectedOption();
UpdateCharacter(selectedOption);
}

// Update is called once per frame
void Update()
{
float directionY = Input.GetAxisRaw("Vertical");
playerDirection = new Vector2(0, directionY).normalized;
}

void FixedUpdate()
{
rb.velocity = new Vector2(0, playerDirection.y * playerSpeed);
}

private void UpdateCharacter(int selectedOption)
{
Character character = characterDB.GetCharacter(selectedOption);
artworkSprite.sprite = character.characterSprite;
nameText.text = character.characterName;
}

private void LoadSelectedOption()
{
if (!PlayerPrefs.HasKey("SelectedOption"))
{
selectedOption = 0;
}
else
{
selectedOption = PlayerPrefs.GetInt("SelectedOption");
}
}
}

please i need really help i was triying some hours to fix this and i dont get fix anything

 

The answer is always the same... ALWAYS!

How to fix a NullReferenceException error

https://forum.unity.com/threads/how-to-fix-a-nullreferenceexception-error.1230297/

Three steps to success:
- Identify what is null <-- any other action taken before this step is WASTED TIME
- Identify why it is null
- Fix that

 

Does it work in the editor?

In any case, the error is in line 43:
Assets/Scripts/Player.cs:43

Try to think of reasons why whatever object on that line (we can't tell because you didn't use code tags) may be null. If it happens in playmode too, attach the debugger of the IDE you are using and set a breakpoint.