diff --git a/src/main/java/org/bukkit/craftbukkit/generator/CustomChunkGenerator.java b/src/main/java/org/bukkit/craftbukkit/generator/CustomChunkGenerator.java
index 9ce28303b..6a5d23106 100644
--- a/src/main/java/org/bukkit/craftbukkit/generator/CustomChunkGenerator.java
+++ b/src/main/java/org/bukkit/craftbukkit/generator/CustomChunkGenerator.java
@@ -306,6 +306,6 @@ public class CustomChunkGenerator extends InternalChunkGenerator {
 
     @Override
     protected Codec<? extends net.minecraft.world.level.chunk.ChunkGenerator> codec() {
-        throw new UnsupportedOperationException("Cannot serialize CustomChunkGenerator");
+        return Codec.unit(null);
     }
 }