diff --git a/CraftBukkit-Patches/0131-Use-Offline-Player-Data-Once-if-Required.patch b/CraftBukkit-Patches/0131-Use-Offline-Player-Data-Once-if-Required.patch
new file mode 100644
index 000000000..387142629
--- /dev/null
+++ b/CraftBukkit-Patches/0131-Use-Offline-Player-Data-Once-if-Required.patch
@@ -0,0 +1,43 @@
+From a5991905982ab3d4eee97b4b7e59771d5c17ddbf Mon Sep 17 00:00:00 2001
+From: md_5 <git@md-5.net>
+Date: Sun, 13 Apr 2014 14:41:23 +1000
+Subject: [PATCH] Use Offline Player Data Once if Required.
+
+If we are online mode and the only copy of player data we can find is the player's offline mode data, we will attempt a once off conversion by reading this data and then renaming the file so it won't be used again.
+
+diff --git a/src/main/java/net/minecraft/server/WorldNBTStorage.java b/src/main/java/net/minecraft/server/WorldNBTStorage.java
+index fabc72b..89ba461 100644
+--- a/src/main/java/net/minecraft/server/WorldNBTStorage.java
++++ b/src/main/java/net/minecraft/server/WorldNBTStorage.java
+@@ -196,10 +196,28 @@ public class WorldNBTStorage implements IDataManager, IPlayerFileData {
+ 
+         try {
+             File file1 = new File(this.playerDir, entityhuman.getUniqueID().toString() + ".dat");
++            // Spigot Start
++            boolean usingWrongFile = false;
++            if ( !file1.exists() )
++            {
++                file1 = new File( this.playerDir, UUID.nameUUIDFromBytes( ( "OfflinePlayer:" + entityhuman.getName() ).getBytes( "UTF-8" ) ).toString() );
++                if ( file1.exists() )
++                {
++                    usingWrongFile = true;
++                    org.bukkit.Bukkit.getServer().getLogger().warning( "Using offline mode UUID file for player " + entityhuman.getName() + " as it is the only copy we can find." );
++                }
++            }
++            // Spigot End
+ 
+             if (file1.exists() && file1.isFile()) {
+                 nbttagcompound = NBTCompressedStreamTools.a((InputStream) (new FileInputStream(file1)));
+             }
++            // Spigot Start
++            if ( usingWrongFile )
++            {
++                file1.renameTo( new File( file1.getPath() + ".offline-read" ) );
++            }
++            // Spigot End
+         } catch (Exception exception) {
+             a.warn("Failed to load player data for " + entityhuman.getName());
+         }
+-- 
+1.8.3.2
+