Folia Support?

BetterRTPAddons/pom.xml

@@ -7,7 +7,7 @@
     <groupId>me.SuperRonanCraft</groupId>
     <artifactId>BetterRTPAddons</artifactId>
     <packaging>jar</packaging>
-    <version>1.8.6</version>
+    <version>1.8.7</version>
 
     <properties>
         <maven.compiler.source>1.8</maven.compiler.source>
@@ -109,7 +109,7 @@
         <dependency>
             <groupId>me.SuperRonanCraft</groupId>
             <artifactId>BetterRTP</artifactId>
-            <version>3.6.6</version>
+            <version>3.6.7</version>
             <scope>provided</scope>
         </dependency>
         <!-- ProtocolLib -->

BetterRTPAddons/src/main/java/me/SuperRonanCraft/BetterRTPAddons/addons/rtpmenu/RTPMenu_Refresh.java

@@ -7,6 +7,7 @@ import org.bukkit.event.EventHandler;
 import org.bukkit.event.HandlerList;
 import org.bukkit.event.Listener;
 import org.bukkit.event.inventory.InventoryCloseEvent;
+import org.bukkit.event.player.PlayerQuitEvent;
 import org.bukkit.scheduler.BukkitRunnable;
 import org.bukkit.scheduler.BukkitTask;
 
@@ -32,7 +33,10 @@ public class RTPMenu_Refresh implements Listener {
 
     private void start() {
         opening = true;
-        RTPMenu_SelectWorld.createInv(addon, player);
+        if (!RTPMenu_SelectWorld.createInv(addon, player)) {
+            cancel();
+            return;
+        }
         opening = false;
         this.task = new BukkitRunnable() {
             @Override public void run() {
@@ -44,9 +48,21 @@ public class RTPMenu_Refresh implements Listener {
     @EventHandler
     void close(InventoryCloseEvent e) {
         if (e.getPlayer() == player && !opening) {
-            task.cancel();
-            HandlerList.unregisterAll(this);
+            cancel();
         }
     }
 
+    @EventHandler
+    void leave(PlayerQuitEvent e) {
+        if (e.getPlayer() == player) {
+            cancel();
+        }
+    }
+
+    void cancel() {
+        if (task != null)
+            task.cancel();
+        HandlerList.unregisterAll(this);
+    }
+
 }

BetterRTPAddons/src/main/java/me/SuperRonanCraft/BetterRTPAddons/addons/rtpmenu/RTPMenu_SelectWorld.java

@@ -23,7 +23,7 @@ import java.util.Map;
 
 public class RTPMenu_SelectWorld {
 
-    public static void createInv(AddonRTPMenu pl, Player p) {
+    public static boolean createInv(AddonRTPMenu pl, Player p) {
         List<World> bukkit_worlds = Bukkit.getWorlds();
         List<World> actual_worlds = new ArrayList<>();
         for (World world : bukkit_worlds) {
@@ -32,7 +32,7 @@ public class RTPMenu_SelectWorld {
         }
         if (actual_worlds.isEmpty() || (actual_worlds.size() <= 1 && !BetterRTP.getInstance().getSettings().isDebug())) {
             CmdTeleport.teleport(p, "rtp", null, null);
-            return;
+            return false;
         }
         int size = Math.floorDiv(actual_worlds.size(), 9) * 9;
         if (size < actual_worlds.size()) size += 9;
@@ -58,6 +58,7 @@ public class RTPMenu_SelectWorld {
         pl.getData(p).setMenuInv(inv);
         pl.getData(p).setWorldSlots(world_slots);
         p.openInventory(inv);
+        return true;
     }
 
     private static HashMap<Integer, World> centerWorlds(List<World> actual_worlds) {