1.8.8 YAML Configuration NPE

When trying to get/set with the YAML Custom Configuration it throws an NPE.

Error:

Code (Text):

Caused by: java.lang.NullPointerException
        at sharked.io.userstyles.UserStyles.onJoin(UserStyles.java:64) ~[?:?]
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_241]
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_241]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_241]
        at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_241]
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:306) ~[server.jar:git-Spigot-db6de12-18fbb24]
        ... 14 more

Main Class:

Code (Java):

private DataFile users;
    private DataFile config;

    private HashMap<Player, ChatColor> style = new HashMap<>();

    @Override
    public void onEnable() {
        Bukkit.getPluginManager().registerEvents(this, this);

        DataFile users = new DataFile(this, "users", true);
        DataFile config = new DataFile(this, "config", true);
    }

    @Override
    public boolean onCommand(CommandSender sender, Command command, String label, String[] args) {
        Player p = (Player) sender;

        if(command.getName().equalsIgnoreCase("style")){
            users.getConfig().set("users." + p.getUniqueId() + ".style", "bold"); // Error Here
            users.saveConfig();
            p.sendMessage("Style Set");

            return true;
        }
        return false;
    }

    @EventHandler(priority = EventPriority.HIGHEST, ignoreCancelled = true)
    public void onChat(AsyncPlayerChatEvent e){
        Player p = (Player) e.getPlayer();

        if(users.getConfig().getConfigurationSection("users").getKeys(false).contains(p.getUniqueId())){ // Error Here
            switch (users.getConfig().get("users." + p.getUniqueId() + ".style").toString().toLowerCase()){ // Error Here
                case ("bold"):
                    style.put(p, ChatColor.BOLD);
            }
            e.setFormat(e.getFormat().replaceFirst(p.getName(), style.get(p) + p.getName()));
        }
    }

    @EventHandler
    public void onJoin(PlayerJoinEvent e){
        Player p = (Player) e.getPlayer();

        if(!users.getConfig().getConfigurationSection("users").getKeys(false).contains(p.getUniqueId())){
            users.getConfig().set("users", p.getUniqueId()); // Error Here
            users.saveConfig();
        }
    }

DataFile Class:

Code (Java):

public class DataFile {

    private JavaPlugin plugin;
    private FileConfiguration configuration;
    private boolean hasDefault;
    private File file;
    private String fileName;

    public DataFile(JavaPlugin plugin, String fileName, boolean hasDefault) {
        this.plugin = plugin;
        this.hasDefault = hasDefault;
        this.fileName = fileName;
        file = new File(plugin.getDataFolder() + File.separator + fileName + ".yml");
        reload();
    }

    public void reload() {
        if (!file.exists()) {
            plugin.getDataFolder().mkdirs();
            try {
                if (hasDefault) {
                    plugin.saveResource(fileName + ".yml", false);
                } else {
                    file.createNewFile();
                }
            } catch (IOException ex) {
                ex.printStackTrace();
            }
        }
        loadConfig();
    }

    public void loadConfig() {
        configuration = new YamlConfiguration();
        try {
            configuration.loadFromString(Files.toString(file, Charset.forName("UTF-8")));

        } catch (IOException | InvalidConfigurationException ex) {
            ex.printStackTrace();
        }
    }

    public FileConfiguration getConfig() {
        return configuration;
    }

    public String getString(String key) {
        return configuration.getString(key);
    }

    public double getDouble(String key) {
        return configuration.getDouble(key);
    }

    public void saveConfig() {
        try {
            configuration.save(file);
        } catch (IOException ex) {
            ex.printStackTrace();
        }
    }

    public File getFile() {
        return file;
    }
}

 

Cheers it worked

 

Edit: This error still persists in most cases