diff --git a/pom.xml b/pom.xml
index 0f87a21..1f34482 100644
--- a/pom.xml
+++ b/pom.xml
@@ -25,7 +25,7 @@
         <dependency>
             <groupId>io.papermc.paper</groupId>
             <artifactId>paper-api</artifactId>
-            <version>1.21-R0.1-SNAPSHOT</version>
+            <version>1.21.4-R0.1-SNAPSHOT</version>
             <scope>provided</scope>
         </dependency>
         <dependency>
diff --git a/src/main/java/de/iani/treasurechest/TreasureChestItem.java b/src/main/java/de/iani/treasurechest/TreasureChestItem.java
index c0f0b09..fec852d 100644
--- a/src/main/java/de/iani/treasurechest/TreasureChestItem.java
+++ b/src/main/java/de/iani/treasurechest/TreasureChestItem.java
@@ -72,8 +72,10 @@
 
     protected void restoreAfterDeserializationInternal() {
         displayItem = ItemStacks.restoreAfterDeserialization(displayItem);
-        for (int i = 0; i < priceItems.length; i++) {
-            priceItems[i] = ItemStacks.restoreAfterDeserialization(priceItems[i]);
+        if (priceItems != null) {
+            for (int i = 0; i < priceItems.length; i++) {
+                priceItems[i] = ItemStacks.restoreAfterDeserialization(priceItems[i]);
+            }
         }
     }
 }