diff --git a/java/json-transform/build.gradle b/java/json-transform/build.gradle
index 0d5a299..b67b8bd 100644
--- a/java/json-transform/build.gradle
+++ b/java/json-transform/build.gradle
@@ -9,7 +9,7 @@ plugins {
 }
 
 group 'co.nlighten'
-version = '0.2.3'
+version = '0.2.4'
 
 ext {
     gsonVersion = "2.10.1"
diff --git a/java/json-transform/src/main/java/co/nlighten/jsontransform/functions/TransformerFunctionFlatten.java b/java/json-transform/src/main/java/co/nlighten/jsontransform/functions/TransformerFunctionFlatten.java
index bd336c6..1e3c90c 100644
--- a/java/json-transform/src/main/java/co/nlighten/jsontransform/functions/TransformerFunctionFlatten.java
+++ b/java/json-transform/src/main/java/co/nlighten/jsontransform/functions/TransformerFunctionFlatten.java
@@ -59,7 +59,7 @@ private JE flatten(JE source, JO target, String prefix, String arrayPrefix) {
                 for (var i = 0; i < size; i++) {
                     flatten(adapter.jArray.get(ja, i), target, (prefix == null ? "" : (prefix + ".")) + arrayPrefix + i, arrayPrefix);
                 }
-            } else {
+            } else if (prefix != null) {
                 adapter.jObject.add(target, prefix, ja);
             }
         } else {