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/ClientboundChatPacket.java b/src/main/java/net/minecraft/network/protocol/game/ClientboundChatPacket.java
index 002a6c7933f64405707d7d34d3e5c17584539623..a983785bf3bc43f65bd0809870c14a9fd30a3fc1 100644
--- a/src/main/java/net/minecraft/network/protocol/game/ClientboundChatPacket.java
+++ b/src/main/java/net/minecraft/network/protocol/game/ClientboundChatPacket.java
@@ -3,6 +3,7 @@ package net.minecraft.network.protocol.game;
 
 import java.io.IOException;
 import java.util.UUID;
+import net.minecraft.Util;
 import net.minecraft.network.FriendlyByteBuf;
 import net.minecraft.network.chat.ChatType;
 import net.minecraft.network.chat.Component;
@@ -21,7 +22,7 @@ public class ClientboundChatPacket implements Packet<ClientGamePacketListener> {
     public ClientboundChatPacket(Component message, ChatType location, UUID senderUuid) {
         this.message = message;
         this.type = location;
-        this.sender = senderUuid;
+        this.sender = senderUuid != null ? senderUuid : Util.getNullUUID(); // Paper
     }
 
     @Override