From 49bdd92faae6bc29c432f87141072e663e0dad87 Mon Sep 17 00:00:00 2001
From: "Dylan K. Taylor" <odigiman@gmail.com>
Date: Fri, 11 Jan 2019 17:56:18 +0000
Subject: [PATCH] LoginPacket: Assert that extradata must exist

---
 src/pocketmine/network/mcpe/protocol/LoginPacket.php | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/pocketmine/network/mcpe/protocol/LoginPacket.php b/src/pocketmine/network/mcpe/protocol/LoginPacket.php
index 28a09b742..bad35b06b 100644
--- a/src/pocketmine/network/mcpe/protocol/LoginPacket.php
+++ b/src/pocketmine/network/mcpe/protocol/LoginPacket.php
@@ -163,6 +163,9 @@ class LoginPacket extends DataPacket{
 				$this->xuid = $claims["extraData"]["XUID"];
 			}
 		}
+		if(!$hasExtraData){
+			throw new \UnexpectedValueException("'extraData' not found in chain data");
+		}
 
 		$this->clientDataJwt = $buffer->get($buffer->getLInt());
 		$clientData = Utils::getJwtClaims($this->clientDataJwt);