From 93631bd1f21b09409d0e6750cd25a631544bd37f Mon Sep 17 00:00:00 2001
From: CraftBukkit/Spigot <noreply+git-craftbukkit@papermc.io>
Date: Tue, 24 Dec 2019 10:20:39 +1100
Subject: [PATCH] SPIGOT-5476: Fix trading empty items

By: md_5 <git@md-5.net>
---
 paper-server/nms-patches/MerchantRecipe.patch | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/paper-server/nms-patches/MerchantRecipe.patch b/paper-server/nms-patches/MerchantRecipe.patch
index 8c880303f1..b0ca841a1e 100644
--- a/paper-server/nms-patches/MerchantRecipe.patch
+++ b/paper-server/nms-patches/MerchantRecipe.patch
@@ -27,3 +27,11 @@
  
      public MerchantRecipe(NBTTagCompound nbttagcompound) {
          this.rewardExp = true;
+@@ -73,6 +87,7 @@
+ 
+     public ItemStack getBuyItem1() {
+         int i = this.buyingItem1.getCount();
++        if (i <= 0) return ItemStack.a; // CraftBukkit - SPIGOT-5476
+         ItemStack itemstack = this.buyingItem1.cloneItemStack();
+         int j = Math.max(0, MathHelper.d((float) (i * this.demand) * this.priceMultiplier));
+