From 7fce67144dd1b610d4c250939f194b04b0f64a9e Mon Sep 17 00:00:00 2001
From: md_5 <git@md-5.net>
Date: Wed, 8 Mar 2017 14:33:40 +1100
Subject: [PATCH] SPIGOT-3108: Hack around mirroring empty item stacks

---
 .../java/org/bukkit/craftbukkit/inventory/CraftItemStack.java   | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemStack.java b/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemStack.java
index 6adbbd4acc..a54bc7c423 100644
--- a/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemStack.java
+++ b/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemStack.java
@@ -71,7 +71,7 @@ public final class CraftItemStack extends ItemStack {
     }
 
     public static CraftItemStack asCraftMirror(net.minecraft.server.ItemStack original) {
-        return new CraftItemStack(original);
+        return new CraftItemStack((original == null || original.isEmpty()) ? null : original);
     }
 
     public static CraftItemStack asCraftCopy(ItemStack original) {