From d64561b0b1a919dc8b39184ca4ffbd1df038aedc Mon Sep 17 00:00:00 2001
From: "Dylan K. Taylor" <odigiman@gmail.com>
Date: Mon, 1 Jun 2020 12:39:17 +0100
Subject: [PATCH] Fixed internal server error when deleting book pages that
 only exist client side

---
 src/pocketmine/Player.php | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/pocketmine/Player.php b/src/pocketmine/Player.php
index de0d99e47..20d76562d 100644
--- a/src/pocketmine/Player.php
+++ b/src/pocketmine/Player.php
@@ -3081,6 +3081,9 @@ class Player extends Human implements CommandSender, ChunkLoader, IPlayer{
 				$modifiedPages[] = $packet->pageNumber;
 				break;
 			case BookEditPacket::TYPE_DELETE_PAGE:
+				if(!$newBook->pageExists($packet->pageNumber)){
+					return false;
+				}
 				$newBook->deletePage($packet->pageNumber);
 				$modifiedPages[] = $packet->pageNumber;
 				break;