diff --git a/navalplanner-gantt-zk/src/main/java/org/zkoss/ganttz/util/MutableTreeModel.java b/navalplanner-gantt-zk/src/main/java/org/zkoss/ganttz/util/MutableTreeModel.java
index 05d855214..91472722e 100644
--- a/navalplanner-gantt-zk/src/main/java/org/zkoss/ganttz/util/MutableTreeModel.java
+++ b/navalplanner-gantt-zk/src/main/java/org/zkoss/ganttz/util/MutableTreeModel.java
@@ -172,6 +172,8 @@ public class MutableTreeModel<T> extends AbstractTreeModel {
     }
 
     private void add(Node<T> parent, Integer position, List<Node<T>> children) {
+        if (children.isEmpty())
+            return;
         int indexFrom = position == null ? parent.children.size() : position;
         int indexTo = indexFrom + children.size() - 1;
         parent.addAll(position, children);
diff --git a/navalplanner-gantt-zk/src/test/java/org/zkoss/ganttz/util/MutableTreeModelTest.java b/navalplanner-gantt-zk/src/test/java/org/zkoss/ganttz/util/MutableTreeModelTest.java
index 20a4ff7e3..e3836d5d3 100644
--- a/navalplanner-gantt-zk/src/test/java/org/zkoss/ganttz/util/MutableTreeModelTest.java
+++ b/navalplanner-gantt-zk/src/test/java/org/zkoss/ganttz/util/MutableTreeModelTest.java
@@ -236,6 +236,21 @@ public class MutableTreeModelTest {
         assertThat(model.getChildCount(model.getRoot()), equalTo(2));
     }
 
+    @Test
+    public void addingAnEmptyListOfElementsDontDoNothing() {
+        MutableTreeModel<Prueba> model = MutableTreeModel.create(Prueba.class);
+        final List<TreeDataEvent> events = new ArrayList<TreeDataEvent>();
+        model.addTreeDataListener(new TreeDataListener() {
+
+            @Override
+            public void onChange(TreeDataEvent event) {
+                events.add(event);
+            }
+        });
+        model.add(model.getRoot(), new ArrayList<Prueba>());
+        assertThat(events.size(), equalTo(0));
+    }
+
     @Test
     public void aNodeCanBeRemoved() {
         MutableTreeModel<Prueba> model = MutableTreeModel.create(Prueba.class);