From dad991e7aa6494c8427bba9a4c8d784fe3c87b01 Mon Sep 17 00:00:00 2001
From: dordsor21 <dordsor21@gmail.com>
Date: Tue, 14 Sep 2021 14:32:42 +0100
Subject: [PATCH] synchronise filterBlocks - we shouldn't be able to execute
 the call method whilst a filter is ongoing and vice versa

---
 .../core/queue/implementation/chunk/ChunkHolder.java            | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/worldedit-core/src/main/java/com/fastasyncworldedit/core/queue/implementation/chunk/ChunkHolder.java b/worldedit-core/src/main/java/com/fastasyncworldedit/core/queue/implementation/chunk/ChunkHolder.java
index 4496a9aa0..7a7706f87 100644
--- a/worldedit-core/src/main/java/com/fastasyncworldedit/core/queue/implementation/chunk/ChunkHolder.java
+++ b/worldedit-core/src/main/java/com/fastasyncworldedit/core/queue/implementation/chunk/ChunkHolder.java
@@ -886,7 +886,7 @@ public class ChunkHolder<T extends Future<T>> implements IQueueChunk<T> {
     }
 
     @Override
-    public void filterBlocks(Filter filter, ChunkFilterBlock block, @Nullable Region region, boolean full) {
+    public synchronized void filterBlocks(Filter filter, ChunkFilterBlock block, @Nullable Region region, boolean full) {
         final IChunkGet get = getOrCreateGet();
         final IChunkSet set = getOrCreateSet();
         set.setFastMode(fastmode);