Getting a NullReferenceException after implementing LazyValue on BaseStats

[Hyprn]

So I took on the challenge and got a NullReferenceException in my BaseStats.cs file.

The line it’s referring to (see below) is the onLevelUp() call within the UpdateLevel() method. I then followed what the video showed and the code is near (as far as I can see at the moment) identical.

Anyone have any thoughts on what I did wrong?

using GameDevTV.Utils;
using RPG.Resources;
using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;

namespace RPG.Stats
{
    public class BaseStats : MonoBehaviour
    {
        [Range(1,99)]
        [SerializeField] int startingLevel = 1;
        [SerializeField] CharacterClass characterClass;
        [SerializeField] Progression progression = null;
        [SerializeField] GameObject levelUpParticleEffect = null;
        [SerializeField] bool shouldUseModifiers = false;

        public event Action onLevelUp;

        LazyValue<int> currentLevel;

        Experience experience;

        private void Awake()
        {
            experience = GetComponent<Experience>();
            currentLevel = new LazyValue<int>(CalculateLevel);
        }

        private void Start()
        {
            currentLevel.ForceInit();
        }

        private void OnEnable()
        {
            if (experience != null)
            {
                experience.onExperienceGained += UpdateLevel;
            }
        }

        private void OnDisable()
        {
            if (experience != null)
            {
                experience.onExperienceGained -= UpdateLevel;
            }
        }

        private void UpdateLevel()
        {
            int newLevel = CalculateLevel();
            if (newLevel > currentLevel.value)
            {
                currentLevel.value = newLevel;
                LevelUpEffect();
                onLevelUp();   //Error is generated right on this line
            }
        }

        private void LevelUpEffect()
        {
            Instantiate(levelUpParticleEffect, transform);
        }

        public float GetStat(Stat stat)
        {
            return (GetBaseStat(stat) + GetAdditiveModifier(stat)) * (1 + GetPercentageModifier(stat)/100);
        }

        private float GetBaseStat(Stat stat)
        {
            return progression.GetStat(stat, characterClass, GetLevel());
        }


        public int GetLevel()
        {
            return currentLevel.value;
        }
        private float GetAdditiveModifier(Stat stat)
        {
            if (!shouldUseModifiers) return 0;

            float totalModifiers = 0;
            foreach(IModifierProvider provider in GetComponents<IModifierProvider>())
            {
                foreach (float modifier in provider.GetAdditiveModifiers(stat))
                {
                    totalModifiers += modifier;
                }
            }
            return totalModifiers;
        }

        private float GetPercentageModifier(Stat stat)
        {
            if (!shouldUseModifiers) return 0;
            float totalModifiers = 0;
            foreach (IModifierProvider provider in GetComponents<IModifierProvider>())
            {
                foreach (float modifier in provider.GetPercentModifier(stat))
                {
                    totalModifiers += modifier;
                }
            }
            return totalModifiers;
        }

        private int CalculateLevel()
        {
            Experience experience = GetComponent<Experience>();

            if (experience == null) return startingLevel;

            float currentXP = experience.GetExperience();
            int penultimateLevel = progression.GetLevels(Stat.ExperienceToLevelUp, characterClass);
            for (int level = 1; level <= penultimateLevel; level++)
            {
                float XPtoLevelUp = progression.GetStat(Stat.ExperienceToLevelUp, characterClass, level);
                if (XPtoLevelUp> currentXP)
                {
                    return level;
                }
            }
            return penultimateLevel + 1;
        }
    }

}

[Hyprn]

Found my issue, for some reason I had the PlayerController.cs on my Character Prefab which made it on all my enemies. Once I took it off the Character Prefab and added it to only the Player prefab, it worked 100% as expected.