Unity & CSharp - Null Reference Error Help

Hey guys, I'm pretty new to C# (about a week lol) and have been following a ton of Unity tutorials and am working on creating my own small project.

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The concept is simple, click on the bomb that's falling, it goes up, and you get a point. It was going well until I tried adding the score mechanic in. I have tried placing the score increments in different places, I've googled a lot and haven't found anything that helps. I created one of the Unity projects (Roll A Ball) following one of their tutorials, and it has a similar mechanic. Even checking against that code, I can't figure out what's wrong.

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I have an empty named GameController that has the main GameController script on it. I have bombs that spawn that get the Bomb script on them.

This is the error I'm getting: NullReferenceException: Object reference not set to an instance of an object

GameController.setTheFuckingScore () (at Assets/GameController.cs:30)

GameController.isClicked () (at Assets/GameController.cs:41)

GameController.Update () (at Assets/GameController.cs:24)

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Here is my code for the GameController. Also, I have the UI "Score Text" Element set in Unity on the Game Controller Script. (Not sure if I'm explaining this right, here's what I mean: https://prnt.sc/nxj8ee )

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

public class GameController : MonoBehaviour
{

    public Text scoreText;
    private int score;
    public bool clickedOn;

    
    // Start is called before the first frame update
    void Start()
    {
        score = 0;
        setTheFuckingScore();
        clickedOn = false;
        
    }

    // Update is called once per frame
    void Update()
    {
        isClicked();
    }

    // Sets the score
    void setTheFuckingScore()
    {
        scoreText.text = "Score: " + score.ToString();
    }

    public void isClicked()
    {
        if( clickedOn )
        {
            // < make the score work
            clickedOn = false;
            Debug.Log("I got clicked on!");
            score = score + 1;
            setTheFuckingScore();
        }
    }
}

Here is my code for the Bomb Script

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

public class Bomb : GameController
{

    public Rigidbody rb;

    public float t = 0.0f;

    private bool moving = false;




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

    // Update is called once per frame
    void FixedUpdate()
    {

    }

    /// <summary>
    /// OnMouseDown is called when the user has pressed the mouse button while
    /// over the GUIElement or Collider.
    /// </summary>
    void OnMouseDown()
    {
        this.rb.velocity = new Vector3(0, 15, 0);
        clickedOn = true;
    }
    
}

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Any help would be appreciated! Mostly what I saw on google that solved this problem was that people didn't have the initial value set, which I do in the Start. Everything else works, clicking on a bomb makes it bounce up, and I get the Debug.Log. I appreciate any answers and any criticism! Like I said I'm very new so I'm not even sure if I'm heading in the right direction. This is just a hobby of mine so you can shit on me and I won't mind. Thanks!

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Edit: The problem line, according to the error, is this(Inside setTheFuckingScore)

 scoreText.text = "Score: " + score.ToString();