Fixed #942.

src/main/java/com/onarandombox/MultiverseCore/utils/VaultHandler.java

@@ -18,7 +18,7 @@ public class VaultHandler implements Listener {
     private Economy economy;
 
     public VaultHandler(final Plugin plugin) {
-        Bukkit.getPluginManager().registerEvents(this, plugin);
+        Bukkit.getPluginManager().registerEvents(new VaultListener(), plugin);
         setupVaultEconomy();
     }
 
@@ -41,6 +41,7 @@ public class VaultHandler implements Listener {
         return (economy != null);
     }
 
+    private class VaultListener implements Listener {
         @EventHandler
         private void vaultEnabled(PluginEnableEvent event) {
             if (event.getPlugin() != null && event.getPlugin().getName().equals("Vault")) {
@@ -55,6 +56,7 @@ public class VaultHandler implements Listener {
                 setupVaultEconomy();
             }
         }
+    }
 
     /**
      * Returns the Vault economy system if Vault is present and has an economy system enabled.