diff --git a/src/main/java/it/cavallium/data/generator/DataSerializer.java b/src/main/java/it/cavallium/data/generator/DataSerializer.java
index 7ed43e0..5ea12a4 100644
--- a/src/main/java/it/cavallium/data/generator/DataSerializer.java
+++ b/src/main/java/it/cavallium/data/generator/DataSerializer.java
@@ -4,10 +4,11 @@ import java.io.DataInput;
 import java.io.DataOutput;
 import java.io.IOException;
 import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
 
 public interface DataSerializer<T> {
 
-	void serialize(DataOutput dataOutput, @NotNull T data) throws IOException;
+	void serialize(DataOutput dataOutput, @Nullable T data) throws IOException;
 
 	@NotNull T deserialize(DataInput dataInput) throws IOException;
 }