From 3557fe31c92ea8d76c90052f9b8b6da963300c4f Mon Sep 17 00:00:00 2001
From: jk-5 <jeffreykog@me.com>
Date: Sun, 19 Jan 2014 11:21:24 +0100
Subject: [PATCH] Throw an exception when discriminator is not found

---
 .../fml/common/network/FMLIndexedMessageToMessageCodec.java   | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/main/java/cpw/mods/fml/common/network/FMLIndexedMessageToMessageCodec.java b/src/main/java/cpw/mods/fml/common/network/FMLIndexedMessageToMessageCodec.java
index 4ed506a6bb..6562d66813 100644
--- a/src/main/java/cpw/mods/fml/common/network/FMLIndexedMessageToMessageCodec.java
+++ b/src/main/java/cpw/mods/fml/common/network/FMLIndexedMessageToMessageCodec.java
@@ -46,6 +46,10 @@ public abstract class FMLIndexedMessageToMessageCodec<A> extends MessageToMessag
         ByteBuf payload = msg.payload();
         byte discriminator = payload.readByte();
         Class<? extends A> clazz = discriminators.get(discriminator);
+        if(clazz == null)
+        {
+            throw new NullPointerException("Undefined message for discriminator " + discriminator + " in channel " + msg.channel());
+        }
         A newMsg = clazz.newInstance();
         decodeInto(ctx, payload.slice(), newMsg);
         out.add(newMsg);