From 21280b0b1f838622907e2f8513f7477485262812 Mon Sep 17 00:00:00 2001
From: filoghost <filoghost@gmail.com>
Date: Sat, 24 Jul 2021 15:20:00 +0200
Subject: [PATCH] Add defensive copy for ItemStack

---
 .../plugin/hologram/base/BaseItemLine.java                | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/plugin/src/main/java/me/filoghost/holographicdisplays/plugin/hologram/base/BaseItemLine.java b/plugin/src/main/java/me/filoghost/holographicdisplays/plugin/hologram/base/BaseItemLine.java
index e84e7c2f..28990bc2 100644
--- a/plugin/src/main/java/me/filoghost/holographicdisplays/plugin/hologram/base/BaseItemLine.java
+++ b/plugin/src/main/java/me/filoghost/holographicdisplays/plugin/hologram/base/BaseItemLine.java
@@ -56,17 +56,21 @@ public abstract class BaseItemLine extends BaseTouchableLine implements Standard
 
     @Override
     public @Nullable ItemStack getItemStack() {
-        return itemStack;
+        return clone(itemStack);
     }
 
     public void setItemStack(@Nullable ItemStack itemStack) {
         if (itemStack != null) {
             Preconditions.checkArgument(0 < itemStack.getAmount() && itemStack.getAmount() <= 64, "itemStack's amount must be between 1 and 64");
         }
-        this.itemStack = itemStack;
+        this.itemStack = clone(itemStack);
         setChanged();
     }
 
+    private ItemStack clone(@Nullable ItemStack itemStack) {
+        return itemStack != null ? itemStack.clone() : null;
+    }
+
     @Override
     public double getHeight() {
         return 0.7;