Error using Vault

Hey, I need to use Vault in my plugin but I'm getting NullPointerExcecption error while setting up economy.
Method looks like this:

Code:

public boolean setupEconomy() {
        if (plugin.getServer().getPluginManager().getPlugin("Vault") == null) {
            return false;
        }
        RegisteredServiceProvider<Economy> rsp = plugin.getServer().getServicesManager().getRegistration(Economy.class);
        if (rsp == null) {
            return false;
        }
        economy = rsp.getProvider();
        return economy != null;
       
    }

What's wrong with this?

 

Maybe plugin is null?
You can almost always replace the plugin instance with 'Bukkit', e.g. Bukkit.getServer() returns the server singleton.

 

Yes, thank you for quick fix