From 530ae99e9368a5b2e785e251813ea47b7938829d Mon Sep 17 00:00:00 2001
From: Jaoreir <jaoreir@gmail.com>
Date: Sun, 17 Mar 2024 02:20:57 +0800
Subject: [PATCH] Fix NullPointerException when joining a server

---
 .../types/renderers/BlockPartWaystoneUpdateListener.java | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/src/main/java/gollorum/signpost/blockpartdata/types/renderers/BlockPartWaystoneUpdateListener.java b/src/main/java/gollorum/signpost/blockpartdata/types/renderers/BlockPartWaystoneUpdateListener.java
index 444b96a2..38a4d452 100644
--- a/src/main/java/gollorum/signpost/blockpartdata/types/renderers/BlockPartWaystoneUpdateListener.java
+++ b/src/main/java/gollorum/signpost/blockpartdata/types/renderers/BlockPartWaystoneUpdateListener.java
@@ -13,7 +13,12 @@
 public final class BlockPartWaystoneUpdateListener {
 
     private static BlockPartWaystoneUpdateListener instance;
-    public static BlockPartWaystoneUpdateListener getInstance() { return instance; }
+    public static BlockPartWaystoneUpdateListener getInstance() { 
+        if (instance == null) {
+            instance = new BlockPartWaystoneUpdateListener();
+        }
+        return instance; 
+    }
 
     private final WeakHashMap<BlockPart<?>, BiConsumer<BlockPart<?>, WaystoneUpdatedEvent>> listeners = new WeakHashMap<>();
 
@@ -25,7 +30,7 @@ private BlockPartWaystoneUpdateListener(){}
 
     public static void initialize() {
         WaystoneLibrary.onInitializeDo.addListener(lib -> {
-            instance = new BlockPartWaystoneUpdateListener();
+            instance = getInstance();
             lib.updateEventDispatcher.addListener(event -> {
                 for (Map.Entry<BlockPart<?>, BiConsumer<BlockPart<?>, WaystoneUpdatedEvent>> entry : instance.listeners.entrySet().stream().toList())
                     entry.getValue().accept(entry.getKey(), event);