From 62e7adb3bfe0e7ba82f0648189494ff766e82b99 Mon Sep 17 00:00:00 2001
From: Carlos Ruiz <carg67@gmail.com>
Date: Wed, 4 Feb 2015 10:57:18 -0500
Subject: [PATCH] IDEMPIERE-2449 Could not invoke Toolbar listener method:
 onSave - NPE on GridTab.fireDataStatusChanged

---
 org.adempiere.base/src/org/compiere/model/GridTab.java | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/org.adempiere.base/src/org/compiere/model/GridTab.java b/org.adempiere.base/src/org/compiere/model/GridTab.java
index d5dbd16dcc..07c2a0c33e 100644
--- a/org.adempiere.base/src/org/compiere/model/GridTab.java
+++ b/org.adempiere.base/src/org/compiere/model/GridTab.java
@@ -182,7 +182,7 @@ public class GridTab implements DataStatusListener, Evaluatee, Serializable
     /** A list of event listeners for this component.	*/
     protected EventListenerList m_listenerList = new EventListenerList();
     /** Current Data Status Event						*/
-	private DataStatusEvent 	m_DataStatusEvent = null;
+	private volatile DataStatusEvent 	m_DataStatusEvent = null;
 	/**	Query							*/
 	private MQuery 				m_query = new MQuery();
 	private String 				m_oldQuery = "0=9";
@@ -2346,6 +2346,10 @@ public class GridTab implements DataStatusListener, Evaluatee, Serializable
 	 */
 	private void fireDataStatusChanged (DataStatusEvent e)
 	{
+		if (e == null) {
+			log.warning("IDEMPIERE-2449 - event must not arrive null here -> " + Thread.currentThread().getStackTrace());
+			return;  // avoid NPE below
+		}
 		DataStatusListener[] listeners = m_listenerList.getListeners(DataStatusListener.class);
 		if (listeners.length == 0)
 			return;