1.20.5+ bug fix

src/main/java/pers/xanadu/enderdragon/EnderDragon.java

@@ -34,6 +34,7 @@ import java.io.*;
 import java.util.ArrayList;
 import java.util.List;
 import java.util.Objects;
+import java.util.Optional;
 
 import static pers.xanadu.enderdragon.util.UpdateChecker.checkUpdate;
 
@@ -203,8 +204,11 @@ public final class EnderDragon extends JavaPlugin {
         Objects.requireNonNull(getCommand("enderdragon")).setTabCompleter(new TabCompleter());
     }
     private void unregisterCommands(){
-        Objects.requireNonNull(getCommand("enderdragon")).setExecutor(null);
-        Objects.requireNonNull(getCommand("enderdragon")).setTabCompleter(null);
+        Optional.ofNullable(getCommand("enderdragon"))
+                .ifPresent(command -> {
+                    command.setExecutor(null);
+                    command.setTabCompleter(null);
+                });
     }
     private void loadConfig(){
         saveDefaultConfig();

src/main/java/pers/xanadu/enderdragon/listener/DragonFireballListener.java

@@ -12,6 +12,7 @@ import org.bukkit.potion.PotionEffect;
 import pers.xanadu.enderdragon.manager.DragonManager;
 import pers.xanadu.enderdragon.manager.WorldManager;
 import pers.xanadu.enderdragon.metadata.MyDragon;
+import pers.xanadu.enderdragon.util.Version;
 
 import static pers.xanadu.enderdragon.manager.DragonManager.getSpecialKey;
 
@@ -34,6 +35,7 @@ public class DragonFireballListener implements Listener {
 //        }
 //
 //    }
+    private static final Particle ILLEGAL_SPELL_MOB = Version.NBT_UPDATE?null:Particle.valueOf("SPELL_MOB");
 
     @EventHandler(priority = EventPriority.HIGH)
     public void OnEffectCloudSpawn(final EntitySpawnEvent e){
@@ -51,8 +53,14 @@ public class DragonFireballListener implements Listener {
         effectCloud.setRadiusPerTick((float) myDragon.effect_cloud_expand_speed/20f);
         effectCloud.setDuration(myDragon.effect_cloud_duration * 20);
         if(myDragon.effect_cloud_color_R != -1){
-            effectCloud.setParticle(Particle.SPELL_MOB);
-            effectCloud.setColor(Color.fromRGB(myDragon.effect_cloud_color_R,myDragon.effect_cloud_color_G,myDragon.effect_cloud_color_B));
+            Color color = Color.fromRGB(myDragon.effect_cloud_color_R,myDragon.effect_cloud_color_G,myDragon.effect_cloud_color_B);
+            if (Version.NBT_UPDATE){
+                effectCloud.setParticle(Particle.ENTITY_EFFECT, color);
+            }
+            else{
+                effectCloud.setParticle(ILLEGAL_SPELL_MOB);
+            }
+            effectCloud.setColor(color);
         }
         effectCloud.clearCustomEffects();
         for(PotionEffect effect : myDragon.effect_cloud_potion){

src/main/java/pers/xanadu/enderdragon/listener/PlayerListener.java

@@ -15,6 +15,7 @@ import org.bukkit.event.player.PlayerJoinEvent;
 import org.bukkit.event.player.PlayerQuitEvent;
 import org.bukkit.inventory.ItemStack;
 import pers.xanadu.enderdragon.config.Config;
+import pers.xanadu.enderdragon.manager.DragonManager;
 import pers.xanadu.enderdragon.manager.GlowManager;
 
 import java.util.Collection;
@@ -57,7 +58,7 @@ public class PlayerListener implements Listener {
             int amount = item.getAmount();
             e.getItem().setAmount(amount-1);
         }
-        EnderCrystal crystal = (EnderCrystal) world.spawnEntity(cen,EntityType.ENDER_CRYSTAL);
+        EnderCrystal crystal = (EnderCrystal) world.spawnEntity(cen, DragonManager.getENDER_CRYSTAL());
         crystal.setShowingBottom(false);
     }