From d9a4a62f7cdc012888ebe8a0430c01f8393effae Mon Sep 17 00:00:00 2001
From: altrisi <altrisi.trillosierra@gmail.com>
Date: Fri, 20 Jan 2023 14:34:45 +0100
Subject: [PATCH] Fix NPE in a validator from registry access refactor

---
 src/main/java/carpet/CarpetSettings.java | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/main/java/carpet/CarpetSettings.java b/src/main/java/carpet/CarpetSettings.java
index e8ffeabc..f52fa3b3 100644
--- a/src/main/java/carpet/CarpetSettings.java
+++ b/src/main/java/carpet/CarpetSettings.java
@@ -977,6 +977,7 @@ public class CarpetSettings
 
         @Override
         public String validate(CommandSourceStack source, CarpetRule<String> currentRule, String newValue, String string) {
+            if (source == null) return newValue; // closing or sync
             Optional<Block> ignoredBlock = source.registryAccess().registryOrThrow(Registries.BLOCK).getOptional(ResourceLocation.tryParse(newValue));
             if (!ignoredBlock.isPresent()) {
                 Messenger.m(source, "r Unknown block '" + newValue + "'.");