From d94ed4ebd4ee52bf09dd2bda8992f8834cc828c8 Mon Sep 17 00:00:00 2001
From: Nassim Jahnke <nassim@njahnke.dev>
Date: Fri, 3 Mar 2023 15:14:52 +0100
Subject: [PATCH] Allow null rewrite function in TagRewriter

---
 .../com/viaversion/viaversion/rewriter/TagRewriter.java   | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/common/src/main/java/com/viaversion/viaversion/rewriter/TagRewriter.java b/common/src/main/java/com/viaversion/viaversion/rewriter/TagRewriter.java
index 8546d8d92..8f01ec658 100644
--- a/common/src/main/java/com/viaversion/viaversion/rewriter/TagRewriter.java
+++ b/common/src/main/java/com/viaversion/viaversion/rewriter/TagRewriter.java
@@ -110,9 +110,11 @@ public class TagRewriter<C extends ClientboundPacketType> {
     public void addTag(RegistryType tagType, String tagId, int... unmappedIds) {
         List<TagData> newTags = getOrComputeNewTags(tagType);
         IdRewriteFunction rewriteFunction = getRewriter(tagType);
-        for (int i = 0; i < unmappedIds.length; i++) {
-            int oldId = unmappedIds[i];
-            unmappedIds[i] = rewriteFunction.rewrite(oldId);
+        if (rewriteFunction != null) {
+            for (int i = 0; i < unmappedIds.length; i++) {
+                int unmappedId = unmappedIds[i];
+                unmappedIds[i] = rewriteFunction.rewrite(unmappedId);
+            }
         }
         newTags.add(new TagData(tagId, unmappedIds));
     }