From 07da86f23f53dd2d2e86ee60fe48dde7c9c1d7d0 Mon Sep 17 00:00:00 2001
From: Bukkit/Spigot <noreply+git-bukkit@papermc.io>
Date: Fri, 25 Jan 2019 14:04:38 +1100
Subject: [PATCH] Recipe choice lists should be copied once handed over to
 Bukkit

By: md_5 <git@md-5.net>
---
 .../src/main/java/org/bukkit/inventory/RecipeChoice.java      | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/paper-api/src/main/java/org/bukkit/inventory/RecipeChoice.java b/paper-api/src/main/java/org/bukkit/inventory/RecipeChoice.java
index 8a29ab4bd6..16c7f8e4ec 100644
--- a/paper-api/src/main/java/org/bukkit/inventory/RecipeChoice.java
+++ b/paper-api/src/main/java/org/bukkit/inventory/RecipeChoice.java
@@ -50,7 +50,7 @@ public interface RecipeChoice extends Predicate<ItemStack>, Cloneable {
                 Preconditions.checkArgument(choice != null, "Cannot have null choice");
             }
 
-            this.choices = choices;
+            this.choices = new ArrayList<>(choices);
         }
 
         @Override
@@ -150,7 +150,7 @@ public interface RecipeChoice extends Predicate<ItemStack>, Cloneable {
                 Preconditions.checkArgument(choice != null, "Cannot have null choice");
             }
 
-            this.choices = choices;
+            this.choices = new ArrayList<>(choices);
         }
 
         @Override