diff --git a/src/main/java/org/cip4/lib/jdf/jsonutil/rtf/JSONIndentWalker.java b/src/main/java/org/cip4/lib/jdf/jsonutil/rtf/JSONIndentWalker.java
index 38e6474..13d90b4 100644
--- a/src/main/java/org/cip4/lib/jdf/jsonutil/rtf/JSONIndentWalker.java
+++ b/src/main/java/org/cip4/lib/jdf/jsonutil/rtf/JSONIndentWalker.java
@@ -72,6 +72,7 @@
 import java.io.OutputStream;
 import java.io.PrintStream;
 
+import org.apache.commons.io.output.NullPrintStream;
 import org.cip4.jdflib.ifaces.IStreamWriter;
 import org.cip4.jdflib.util.StringUtil;
 import org.cip4.lib.jdf.jsonutil.JSONObjHelper;
@@ -217,6 +218,11 @@ protected String getBeginObj()
 	@Override
 	public void writeStream(final OutputStream os) throws IOException
 	{
+		if (!isRetainNull())
+		{
+			ps = NullPrintStream.INSTANCE;
+			walk();
+		}
 		ps = new PrintStream(os);
 		writeHeader();
 		walk();
@@ -308,7 +314,7 @@ protected String getArraySep()
 	@Override
 	public String toString()
 	{
-		return "JSONIndentWalker [singleIndent=" + singleIndent + ", indent=" + indent + "]";
+		return super.toString() + " [singleIndent=" + singleIndent + ", indent=" + indent + "]";
 	}
 
 }
diff --git a/src/test/java/org/cip4/lib/jdf/jsonutil/rtf/JSONIndentWalkerTest.java b/src/test/java/org/cip4/lib/jdf/jsonutil/rtf/JSONIndentWalkerTest.java
index 05770ee..580c9c6 100644
--- a/src/test/java/org/cip4/lib/jdf/jsonutil/rtf/JSONIndentWalkerTest.java
+++ b/src/test/java/org/cip4/lib/jdf/jsonutil/rtf/JSONIndentWalkerTest.java
@@ -151,4 +151,35 @@ void testCondensedEmptyArray() throws IOException
 		assertEquals(root, roundTrip);
 	}
 
+	@Test
+	void testNoRetainNullEmpty() throws IOException
+	{
+		final JSONObjHelper root = new JSONObjHelper("{\"a\":{\"b\":[],\"c\":{}}}");
+		final JSONIndentWalker w = new JSONIndentWalker(root);
+		w.setSingleIndent(0);
+		w.setCondensed(true);
+		w.setRetainNull(false);
+		final File file = new File(sm_dirTestDataTemp + "testretnull.json");
+		FileUtil.writeFile(w, file);
+		assertTrue(w.isCondensed());
+		final JSONObjHelper roundTrip = new JSONObjHelper(file);
+		assertEquals(new JSONObjHelper("{}"), roundTrip);
+	}
+
+	@Test
+	void testNoRetainNull() throws IOException
+	{
+		final JSONObjHelper root = new JSONObjHelper("{\"a\":{\"b\":[{\"d\":1},{},{\"d\":1}],\"c\":{\"c1\":\"a\",\"c2\":{},\"c3\":\"a\"}}}");
+		final JSONObjHelper root2 = new JSONObjHelper("{\"a\":{\"b\":[{\"d\":1},{\"d\":1}],\"c\":{\"c1\":\"a\",\"c3\":\"a\"}}}");
+		final JSONIndentWalker w = new JSONIndentWalker(root);
+		w.setSingleIndent(0);
+		w.setCondensed(true);
+		w.setRetainNull(false);
+		final File file = new File(sm_dirTestDataTemp + "testret.json");
+		FileUtil.writeFile(w, file);
+		assertTrue(w.isCondensed());
+		final JSONObjHelper roundTrip = new JSONObjHelper(file);
+		assertEquals(root2, roundTrip);
+	}
+
 }