From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: u9g <winworkswow@gmail.com>
Date: Mon, 3 Jan 2022 23:32:42 -0500
Subject: [PATCH] Add missing IAE check for PersistentDataContainer#has


diff --git a/src/main/java/org/bukkit/craftbukkit/persistence/CraftPersistentDataContainer.java b/src/main/java/org/bukkit/craftbukkit/persistence/CraftPersistentDataContainer.java
index 268563389077f92921411e866ec26e312e33ee23..43545bac94fbf118a982b654fbe0d6afc6e25897 100644
--- a/src/main/java/org/bukkit/craftbukkit/persistence/CraftPersistentDataContainer.java
+++ b/src/main/java/org/bukkit/craftbukkit/persistence/CraftPersistentDataContainer.java
@@ -56,6 +56,7 @@ public class CraftPersistentDataContainer implements PersistentDataContainer {
 
     @Override
     public boolean has(NamespacedKey key) {
+        Preconditions.checkArgument(key != null, "The provided key for the custom value was null"); // Paper
         return this.customDataTags.get(key.toString()) != null;
     }