From 7f9357bd63f026f760687e3e55bd19612db46b81 Mon Sep 17 00:00:00 2001
From: CraftBukkit/Spigot <noreply+git-craftbukkit@papermc.io>
Date: Thu, 19 Jan 2012 16:09:24 +0000
Subject: [PATCH] Prevent re-use of internal world dimension IDs. This fixes
 BUKKIT-448. Thanks to snowleo for the PR.

By: Nathan Adams <dinnerbone@dinnerbone.com>
---
 .../main/java/org/bukkit/craftbukkit/CraftServer.java  | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/paper-server/src/main/java/org/bukkit/craftbukkit/CraftServer.java b/paper-server/src/main/java/org/bukkit/craftbukkit/CraftServer.java
index c4846097f7..f3ed843b22 100644
--- a/paper-server/src/main/java/org/bukkit/craftbukkit/CraftServer.java
+++ b/paper-server/src/main/java/org/bukkit/craftbukkit/CraftServer.java
@@ -540,6 +540,16 @@ public final class CraftServer implements Server {
         }
 
         int dimension = 10 + console.worlds.size();
+        boolean used = false;
+        do {
+            for (WorldServer server : console.worlds) {
+                used = server.dimension == dimension;
+               if (used) {
+                    dimension++;
+                    break;
+                }
+            }
+        } while(used);
         boolean hardcore = false;
         WorldServer internal = new WorldServer(console, new ServerNBTManager(getWorldContainer(), name, true), name, dimension, new WorldSettings(creator.seed(), getDefaultGameMode().getValue(), true, hardcore, type), creator.environment(), generator);