diff --git a/src/main/java/de/iani/treasurechest/TreasureChest.java b/src/main/java/de/iani/treasurechest/TreasureChest.java
index b95180a..7a8011b 100644
--- a/src/main/java/de/iani/treasurechest/TreasureChest.java
+++ b/src/main/java/de/iani/treasurechest/TreasureChest.java
@@ -130,13 +130,14 @@
             return false;
         }
         ArrayList<ItemStack> copied = new ArrayList<>();
-        for (ItemStack is : items) {
-            if (is != null && is.getAmount() > 0 && is.getType() != Material.AIR) {
-                copied.add(is.clone());
+        if (items != null) {
+            for (ItemStack is : items) {
+                if (is != null && is.getAmount() > 0 && is.getType() != Material.AIR) {
+                    copied.add(is.clone());
+                }
             }
+            items = copied.toArray(new ItemStack[copied.size()]);
         }
-        items = copied.toArray(new ItemStack[copied.size()]);
-
         TreasureChestItem item = new TreasureChestItem(displayItem, items, money);
         workerThread.addWork(new WorkEntry() {
             @Override