diff --git a/src/main/java/it/cavallium/data/generator/DataSerializer.java b/src/main/java/it/cavallium/data/generator/DataSerializer.java
index 5ea12a4..dd363fa 100644
--- a/src/main/java/it/cavallium/data/generator/DataSerializer.java
+++ b/src/main/java/it/cavallium/data/generator/DataSerializer.java
@@ -8,7 +8,7 @@ import org.jetbrains.annotations.Nullable;
 
 public interface DataSerializer<T> {
 
-	void serialize(DataOutput dataOutput, @Nullable T data) throws IOException;
+	void serialize(DataOutput dataOutput, @NotNull T data) throws IOException;
 
 	@NotNull T deserialize(DataInput dataInput) throws IOException;
 }
diff --git a/src/main/java/it/cavallium/data/generator/nativedata/ArrayInt52Serializer.java b/src/main/java/it/cavallium/data/generator/nativedata/ArrayInt52Serializer.java
index 65276a9..03a66ca 100644
--- a/src/main/java/it/cavallium/data/generator/nativedata/ArrayInt52Serializer.java
+++ b/src/main/java/it/cavallium/data/generator/nativedata/ArrayInt52Serializer.java
@@ -12,8 +12,8 @@ public class ArrayInt52Serializer implements DataSerializer< List<Int52>> {
 	@Override
 	public void serialize(DataOutput dataOutput, List<Int52> data) throws IOException {
 		dataOutput.writeInt(data.size());
-		for (int i = 0; i < data.size(); i++) {
-			Int52Serializer.INSTANCE.serialize(dataOutput, data.get(i));
+		for (Int52 datum : data) {
+			Int52Serializer.INSTANCE.serialize(dataOutput, datum);
 		}
 	}