diff --git a/worldedit-bukkit/src/main/java/com/sk89q/worldedit/bukkit/adapter/impl/FAWE_Spigot_v1_15_R2.java b/worldedit-bukkit/src/main/java/com/sk89q/worldedit/bukkit/adapter/impl/FAWE_Spigot_v1_15_R2.java
index dec7822ca..b7c5b93af 100644
--- a/worldedit-bukkit/src/main/java/com/sk89q/worldedit/bukkit/adapter/impl/FAWE_Spigot_v1_15_R2.java
+++ b/worldedit-bukkit/src/main/java/com/sk89q/worldedit/bukkit/adapter/impl/FAWE_Spigot_v1_15_R2.java
@@ -144,7 +144,7 @@ public final class FAWE_Spigot_v1_15_R2 extends CachedBukkitAdapter implements I
     }
 
     @Override
-    public BlockMaterial getMaterial(BlockState state) {
+    public synchronized BlockMaterial getMaterial(BlockState state) {
         IBlockData bs = ((CraftBlockData) Bukkit.createBlockData(state.getAsString())).getState();
         return new BlockMaterial_1_15_2(bs.getBlock(), bs);
     }
diff --git a/worldedit-bukkit/src/main/java/com/sk89q/worldedit/bukkit/adapter/impl/FAWE_Spigot_v1_16_R1.java b/worldedit-bukkit/src/main/java/com/sk89q/worldedit/bukkit/adapter/impl/FAWE_Spigot_v1_16_R1.java
index a9b95121f..f0a82bfab 100644
--- a/worldedit-bukkit/src/main/java/com/sk89q/worldedit/bukkit/adapter/impl/FAWE_Spigot_v1_16_R1.java
+++ b/worldedit-bukkit/src/main/java/com/sk89q/worldedit/bukkit/adapter/impl/FAWE_Spigot_v1_16_R1.java
@@ -144,7 +144,7 @@ public final class FAWE_Spigot_v1_16_R1 extends CachedBukkitAdapter implements I
     }
 
     @Override
-    public BlockMaterial getMaterial(BlockState state) {
+    public synchronized BlockMaterial getMaterial(BlockState state) {
         IBlockData bs = ((CraftBlockData) Bukkit.createBlockData(state.getAsString())).getState();
         return new BlockMaterial_1_16_1(bs.getBlock(), bs);
     }
diff --git a/worldedit-bukkit/src/main/java/com/sk89q/worldedit/bukkit/adapter/impl/FAWE_Spigot_v1_16_R2.java b/worldedit-bukkit/src/main/java/com/sk89q/worldedit/bukkit/adapter/impl/FAWE_Spigot_v1_16_R2.java
index 681e4a7f0..690d8e2a7 100644
--- a/worldedit-bukkit/src/main/java/com/sk89q/worldedit/bukkit/adapter/impl/FAWE_Spigot_v1_16_R2.java
+++ b/worldedit-bukkit/src/main/java/com/sk89q/worldedit/bukkit/adapter/impl/FAWE_Spigot_v1_16_R2.java
@@ -146,7 +146,7 @@ public final class FAWE_Spigot_v1_16_R2 extends CachedBukkitAdapter implements I
     }
 
     @Override
-    public BlockMaterial getMaterial(BlockState state) {
+    public synchronized BlockMaterial getMaterial(BlockState state) {
         IBlockData bs = ((CraftBlockData) Bukkit.createBlockData(state.getAsString())).getState();
         return new BlockMaterial_1_16_2(bs.getBlock(), bs);
     }
diff --git a/worldedit-bukkit/src/main/java/com/sk89q/worldedit/bukkit/adapter/impl/FAWE_Spigot_v1_16_R3.java b/worldedit-bukkit/src/main/java/com/sk89q/worldedit/bukkit/adapter/impl/FAWE_Spigot_v1_16_R3.java
index 796379693..7f373b6a9 100644
--- a/worldedit-bukkit/src/main/java/com/sk89q/worldedit/bukkit/adapter/impl/FAWE_Spigot_v1_16_R3.java
+++ b/worldedit-bukkit/src/main/java/com/sk89q/worldedit/bukkit/adapter/impl/FAWE_Spigot_v1_16_R3.java
@@ -146,7 +146,7 @@ public final class FAWE_Spigot_v1_16_R3 extends CachedBukkitAdapter implements I
     }
 
     @Override
-    public BlockMaterial getMaterial(BlockState state) {
+    public synchronized BlockMaterial getMaterial(BlockState state) {
         IBlockData bs = ((CraftBlockData) Bukkit.createBlockData(state.getAsString())).getState();
         return new BlockMaterial_1_16_4(bs.getBlock(), bs);
     }