From 4c192dd4e79ca4f084d0d7c50530aa19ce420689 Mon Sep 17 00:00:00 2001
From: CraftBukkit/Spigot <noreply+git-craftbukkit@papermc.io>
Date: Mon, 12 Jun 2023 08:04:28 +1000
Subject: [PATCH] SPIGOT-7381: Fix NullPointerException when setting item in
 ChiseledBookshelfInventory snapshot

By: Parker Hawke <hawkeboyz2@hotmail.com>
---
 .../block/entity/ChiseledBookShelfBlockEntity.patch      | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/paper-server/nms-patches/net/minecraft/world/level/block/entity/ChiseledBookShelfBlockEntity.patch b/paper-server/nms-patches/net/minecraft/world/level/block/entity/ChiseledBookShelfBlockEntity.patch
index f647d65fce..d969704391 100644
--- a/paper-server/nms-patches/net/minecraft/world/level/block/entity/ChiseledBookShelfBlockEntity.patch
+++ b/paper-server/nms-patches/net/minecraft/world/level/block/entity/ChiseledBookShelfBlockEntity.patch
@@ -55,6 +55,15 @@
  
      public ChiseledBookShelfBlockEntity(BlockPosition blockposition, IBlockData iblockdata) {
          super(TileEntityTypes.CHISELED_BOOKSHELF, blockposition, iblockdata);
+@@ -106,7 +148,7 @@
+     public void setItem(int i, ItemStack itemstack) {
+         if (itemstack.is(TagsItem.BOOKSHELF_BOOKS)) {
+             this.items.set(i, itemstack);
+-            this.updateState(i);
++            if (level != null) this.updateState(i); // CraftBukkit - SPIGOT-7381: check for null world
+         }
+ 
+     }
 @@ -120,7 +162,7 @@
  
      @Override