From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Sun, 28 Jun 2020 19:36:55 -0400
Subject: [PATCH] Don't allow null UUID's for chat


diff --git a/src/main/java/net/minecraft/network/protocol/game/PacketPlayOutChat.java b/src/main/java/net/minecraft/network/protocol/game/PacketPlayOutChat.java
index d4cf5536883192c49636177cb782a9a2f514cd87..2203a3d89a3d9f9b3b6b068f6600e79a584f8a67 100644
--- a/src/main/java/net/minecraft/network/protocol/game/PacketPlayOutChat.java
+++ b/src/main/java/net/minecraft/network/protocol/game/PacketPlayOutChat.java
@@ -2,6 +2,7 @@ package net.minecraft.network.protocol.game;
 
 import java.io.IOException;
 import java.util.UUID;
+import net.minecraft.SystemUtils;
 import net.minecraft.network.PacketDataSerializer;
 import net.minecraft.network.chat.ChatMessageType;
 import net.minecraft.network.chat.IChatBaseComponent;
@@ -20,7 +21,7 @@ public class PacketPlayOutChat implements Packet<PacketListenerPlayOut> {
     public PacketPlayOutChat(IChatBaseComponent ichatbasecomponent, ChatMessageType chatmessagetype, UUID uuid) {
         this.a = ichatbasecomponent;
         this.b = chatmessagetype;
-        this.c = uuid;
+        this.c = uuid != null ? uuid : SystemUtils.getNullUUID(); // Paper
     }
 
     @Override