PaperMC/patches/unapplied/server/0804-Fix-crash-relating-to-bad-recipes-in-furnace-like-ti.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Jake Potrebic <jake.m.potrebic@gmail.com>
Date: Sun, 19 Mar 2023 20:36:22 -0700
Subject: [PATCH] Fix crash relating to bad recipes in furnace-like tile
 entities


diff --git a/src/main/java/net/minecraft/world/level/block/entity/AbstractFurnaceBlockEntity.java b/src/main/java/net/minecraft/world/level/block/entity/AbstractFurnaceBlockEntity.java
index f1a7054a0ee1842e78338d8984f151b24c352849..65ab9b22f724877b68f4f25aad2831e2cb080b19 100644
--- a/src/main/java/net/minecraft/world/level/block/entity/AbstractFurnaceBlockEntity.java
+++ b/src/main/java/net/minecraft/world/level/block/entity/AbstractFurnaceBlockEntity.java
@@ -616,6 +616,7 @@ public abstract class AbstractFurnaceBlockEntity extends BaseContainerBlockEntit
             Entry<ResourceLocation> entry = (Entry) objectiterator.next();
 
             worldserver.getRecipeManager().byKey((ResourceLocation) entry.getKey()).ifPresent((recipeholder) -> {
+                if (!(recipeholder.value() instanceof AbstractCookingRecipe)) return; // Paper - don't process non-cooking recipes
                 list.add(recipeholder);
                 AbstractFurnaceBlockEntity.createExperience(worldserver, vec3d, entry.getIntValue(), ((AbstractCookingRecipe) recipeholder.value()).getExperience(), blockposition, entityplayer, itemstack, amount); // CraftBukkit
             });