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 fc3befdbb9..9f06c6ae3a 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
@@ -920,9 +920,11 @@ public class CompositeADTabbox extends AbstractADTabbox
 		}
 		if (!tabPanel.isVisible()) {
 			tabPanel.setVisible(true);
-			Executions.schedule(tabPanel.getDesktop(), e -> {
-				invalidateTabPanel(tabPanel);
-			}, new Event("onPostActivateDetail", tabPanel));	
+			if (tabPanel.getDesktop() != null) {
+				Executions.schedule(tabPanel.getDesktop(), e -> {
+					invalidateTabPanel(tabPanel);
+				}, new Event("onPostActivateDetail", tabPanel));	
+			}
 		} else {
 			invalidateTabPanel(tabPanel);
 		}