diff --git a/ganttzk/src/main/java/org/zkoss/ganttz/DependencyComponent.java b/ganttzk/src/main/java/org/zkoss/ganttz/DependencyComponent.java
index 24a02c272..16afd3359 100644
--- a/ganttzk/src/main/java/org/zkoss/ganttz/DependencyComponent.java
+++ b/ganttzk/src/main/java/org/zkoss/ganttz/DependencyComponent.java
@@ -58,6 +58,8 @@ public class DependencyComponent extends XulElement implements AfterCompose {
 
     private PropertyChangeListener visibilityChangeListener;
 
+    private PropertyChangeListener listener;
+
     private boolean violated = false;
 
     public DependencyComponent(TaskComponent source, TaskComponent destination,
@@ -106,7 +108,7 @@ public class DependencyComponent extends XulElement implements AfterCompose {
         if (listenerAdded) {
             return;
         }
-        PropertyChangeListener listener = new PropertyChangeListener() {
+        listener = new PropertyChangeListener() {
 
             @Override
             public void propertyChange(PropertyChangeEvent evt) {
@@ -118,6 +120,15 @@ public class DependencyComponent extends XulElement implements AfterCompose {
         listenerAdded = true;
     }
 
+    public void removeChangeListeners() {
+        if (!listenerAdded) {
+            return;
+        }
+        this.source.getTask().removePropertyChangeListener(listener);
+        this.destination.getTask().removePropertyChangeListener(listener);
+        listenerAdded = false;
+    }
+
     /**
      * @return the idTaskOrig
      */
diff --git a/ganttzk/src/main/java/org/zkoss/ganttz/DependencyList.java b/ganttzk/src/main/java/org/zkoss/ganttz/DependencyList.java
index c564afeae..04ca965e3 100644
--- a/ganttzk/src/main/java/org/zkoss/ganttz/DependencyList.java
+++ b/ganttzk/src/main/java/org/zkoss/ganttz/DependencyList.java
@@ -304,6 +304,9 @@ public class DependencyList extends XulElement implements AfterCompose {
         source.getTask().removeVisibilityPropertiesChangeListener(listener);
         destination.getTask().removeVisibilityPropertiesChangeListener(listener);
 
+        //remove other change listeners
+        dependencyComponent.removeChangeListeners();
+
         //remove the dependency itself
         this.removeChild(dependencyComponent);
     }