Why is my FOR loop resulting in NullPointerException?

for (String s: config.get(general, "itemsDisabled", new String[] {"minecraft:dirt", "minecraft:stone"}).getStringList())
        {
            try
            {
                itemsDisabled.add(s);
                LogHelper.info(s);
            }
            catch (Exception e)
            {
                LogHelper.error(e);
            }

 

public static List<String> itemsDisabled;

 

Error occurs while trying to add to itemsDisabled.

Sorry