#vulnerable code 
                                @Override
    protected void loadKeys() {
        sensitivity = CarbonSensitivity.LOW;
        String carbonSensitivity = conf.getString("carbonSensitivity");
        if (carbonSensitivity != null && !carbonSensitivity.isEmpty()) {
            try {
                sensitivity = CarbonSensitivity.valueOf(carbonSensitivity);
            } catch (Exception e) {
                GlobalWarming.getInstance().getLogger().warning(
                      String.format(
                            "Unknown carbon sensitivity for: [%s], defaulting to [%s]",
                            getDisplayName(worldId),
                            sensitivity));
            }
        }

        this.enabled = this.conf.getBoolean("enabled");
        this.associatedWorldId = Bukkit.getWorld(this.conf.getString("association")).getUID();
        this.enabledEffects = new HashSet<>();
        this.blastFurnaceMultiplier = this.conf.getDouble("blastFurnaceMultiplier", 1.2);
        this.methaneTicksLivedModifier = this.conf.getDouble("methaneTicksLivedModifier", 0.01);
        this.bonemealReductionAllowed = this.conf.getBoolean("bonemealReductionAllowed", true);
        this.bonemealReductionModifier = this.conf.getDouble("bonemealReductionModifier", 0.5);

        for (String effect : this.conf.getStringList("enabledEffects")) {
            try {
                this.enabledEffects.add(ClimateEffectType.valueOf(effect));
            } catch (IllegalArgumentException ex) {
                GlobalWarming.getInstance().getLogger().severe(String.format(
                      "Could not load effect: [%s] for world: [%s]",
                      effect,
                      getDisplayName(worldId)));
            }
        }
    } 
                            #location 18 
                            #vulnerability type NULL_DEREFERENCE
#fixed code
                                @Override
    protected void loadKeys() {
        sensitivity = CarbonSensitivity.LOW;
        String carbonSensitivity = conf.getString("carbonSensitivity");
        if (carbonSensitivity != null && !carbonSensitivity.isEmpty()) {
            try {
                sensitivity = CarbonSensitivity.valueOf(carbonSensitivity);
            } catch (Exception e) {
                GlobalWarming.getInstance().getLogger().warning(
                      String.format(
                            "Unknown carbon sensitivity for: [%s], defaulting to [%s]",
                            getDisplayName(worldId),
                            sensitivity));
            }
        }

        this.enabled = this.conf.getBoolean("enabled");
        this.associatedWorldId = Bukkit.getWorld(this.conf.getString("association")).getUID();
        this.enabledEffects = new HashSet<>();
        this.methaneTicksLivedModifier = this.conf.getDouble("methaneTicksLivedModifier", 0.01);
        this.bonemealReductionAllowed = this.conf.getBoolean("bonemealReductionAllowed", true);
        this.bonemealReductionModifier = this.conf.getDouble("bonemealReductionModifier", 0.5);

        for (String effect : this.conf.getStringList("enabledEffects")) {
            try {
                this.enabledEffects.add(ClimateEffectType.valueOf(effect));
            } catch (IllegalArgumentException ex) {
                GlobalWarming.getInstance().getLogger().severe(String.format(
                      "Could not load effect: [%s] for world: [%s]",
                      effect,
                      getDisplayName(worldId)));
            }
        }
    }