diff --git a/org.adempiere.ui.zk/WEB-INF/src/org/adempiere/webui/adwindow/CompositeADTabbox.java b/org.adempiere.ui.zk/WEB-INF/src/org/adempiere/webui/adwindow/CompositeADTabbox.java
index 1e2a16d336..8083a0dcfa 100644
--- a/org.adempiere.ui.zk/WEB-INF/src/org/adempiere/webui/adwindow/CompositeADTabbox.java
+++ b/org.adempiere.ui.zk/WEB-INF/src/org/adempiere/webui/adwindow/CompositeADTabbox.java
@@ -537,7 +537,8 @@ public class CompositeADTabbox extends AbstractADTabbox
     			hasChanges = true;
     		}
     		if (hasChanges) {
-    			headerTab.getDetailPane().getParent().invalidate();
+    			if (headerTab.getDetailPane().getParent() != null)
+    				headerTab.getDetailPane().getParent().invalidate();
     		}
     	}
 	}