From d6b7b969b316b6ef3598326407e01300bfeb831b Mon Sep 17 00:00:00 2001
From: somehussar <148253652+somehussar@users.noreply.github.com>
Date: Sun, 1 Feb 2026 03:39:03 +0100
Subject: [PATCH] Fix crash on server

---
 src/main/java/noppes/npcs/CustomNpcs.java | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/main/java/noppes/npcs/CustomNpcs.java b/src/main/java/noppes/npcs/CustomNpcs.java
index ff4617545..0bc081429 100644
--- a/src/main/java/noppes/npcs/CustomNpcs.java
+++ b/src/main/java/noppes/npcs/CustomNpcs.java
@@ -158,7 +158,13 @@ public class CustomNpcs {
     @SideOnly(Side.CLIENT)
     private static IDynamicCompiler clientJaninoCompiler;
     @SideOnly(Side.CLIENT)
-    private final static Set<Consumer<AdvancedClassFilter>> clientClassFilterConsumer = new HashSet<>();
+    private static Set<Consumer<AdvancedClassFilter>> clientClassFilterConsumer;
+
+    static {
+        if (FMLCommonHandler.instance().getEffectiveSide().isClient()) {
+            clientClassFilterConsumer = new HashSet<>();
+        }
+    }
 
     @SideOnly(Side.CLIENT)
     public static void addClassesToClientClassFilter(Consumer<AdvancedClassFilter> consumer) {