diff --git a/src/main/java/org/bukkit/craftbukkit/CraftServer.java b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
index c89b5f26e1..6cc730b1ba 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();