From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: MrHua269 <mrhua269@gmail.com>
Date: Sun, 15 Jun 2025 16:58:05 +0800
Subject: [PATCH] Do not fire pre creature spawn event unless some plugin is
 listening it


diff --git a/net/minecraft/world/level/NaturalSpawner.java b/net/minecraft/world/level/NaturalSpawner.java
index 8911322506794413f9c9e065b6c080759ab862b6..81f4707cf1a7cbdfcfc519cfbe1052cde77aa755 100644
--- a/net/minecraft/world/level/NaturalSpawner.java
+++ b/net/minecraft/world/level/NaturalSpawner.java
@@ -360,16 +360,18 @@ public final class NaturalSpawner {
     ) {
         EntityType<?> entityType = data.type();
         // Paper start - PreCreatureSpawnEvent
-        com.destroystokyo.paper.event.entity.PreCreatureSpawnEvent event = new com.destroystokyo.paper.event.entity.PreCreatureSpawnEvent(
-                org.bukkit.craftbukkit.util.CraftLocation.toBukkit(pos, level),
-                org.bukkit.craftbukkit.entity.CraftEntityType.minecraftToBukkit(entityType), org.bukkit.event.entity.CreatureSpawnEvent.SpawnReason.NATURAL
-        );
-        if (!event.callEvent()) {
-            if (event.shouldAbortSpawn()) {
-                return PreSpawnStatus.ABORT;
+        if (com.destroystokyo.paper.event.entity.PreCreatureSpawnEvent.getHandlerList().getRegisteredListeners().length != 0) { // Luminol - Do not fire pre creature spawn event unless some plugin is listening it
+            com.destroystokyo.paper.event.entity.PreCreatureSpawnEvent event = new com.destroystokyo.paper.event.entity.PreCreatureSpawnEvent(
+                    org.bukkit.craftbukkit.util.CraftLocation.toBukkit(pos, level),
+                    org.bukkit.craftbukkit.entity.CraftEntityType.minecraftToBukkit(entityType), org.bukkit.event.entity.CreatureSpawnEvent.SpawnReason.NATURAL
+            );
+            if (!event.callEvent()) {
+                if (event.shouldAbortSpawn()) {
+                    return PreSpawnStatus.ABORT;
+                }
+                return PreSpawnStatus.CANCELLED;
             }
-            return PreSpawnStatus.CANCELLED;
-        }
+        } // Luminol - Do not fire pre creature spawn event unless some plugin is listening it
         final boolean success = entityType.getCategory() != MobCategory.MISC
         // Paper end - PreCreatureSpawnEvent
             && (