From 47f011966092f275cc1b11f8de635e89fd9651a7 Mon Sep 17 00:00:00 2001
From: "Dylan K. Taylor" <dktapps@pmmp.io>
Date: Mon, 26 Feb 2024 14:35:21 +0000
Subject: [PATCH] InGamePacketHandler: added an extra check

---
 src/network/mcpe/handler/InGamePacketHandler.php | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/network/mcpe/handler/InGamePacketHandler.php b/src/network/mcpe/handler/InGamePacketHandler.php
index 8c3449d41..860f3c465 100644
--- a/src/network/mcpe/handler/InGamePacketHandler.php
+++ b/src/network/mcpe/handler/InGamePacketHandler.php
@@ -869,8 +869,12 @@ class InGamePacketHandler extends PacketHandler{
 	}
 
 	public function handleBookEdit(BookEditPacket $packet) : bool{
+		$inventory = $this->player->getInventory();
+		if(!$inventory->slotExists($packet->inventorySlot)){
+			return false;
+		}
 		//TODO: break this up into book API things
-		$oldBook = $this->player->getInventory()->getItem($packet->inventorySlot);
+		$oldBook = $inventory->getItem($packet->inventorySlot);
 		if(!($oldBook instanceof WritableBook)){
 			return false;
 		}