From 7c395d429ce2bdfe9668664ebe96799cd540e7b7 Mon Sep 17 00:00:00 2001
From: md_5 <git@md-5.net>
Date: Mon, 8 Apr 2019 20:32:00 +1000
Subject: [PATCH] SPIGOT-4681: Note about additional world creation on STARTUP

---
 src/main/java/org/bukkit/craftbukkit/CraftServer.java | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/main/java/org/bukkit/craftbukkit/CraftServer.java b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
index c89b5f26e..6cc730b1b 100644
--- a/src/main/java/org/bukkit/craftbukkit/CraftServer.java
+++ b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
@@ -874,6 +874,7 @@ public final class CraftServer implements Server {
 
     @Override
     public World createWorld(WorldCreator creator) {
+        Preconditions.checkState(!console.worldServer.isEmpty(), "Cannot create additional worlds on STARTUP");
         Validate.notNull(creator, "Creator may not be null");
 
         String name = creator.name();