2 files changed, 14 insertions, 6 deletions
diff --git a/src/newt/classes/com/jogamp/newt/impl/DisplayImpl.java b/src/newt/classes/com/jogamp/newt/impl/DisplayImpl.java
index 894b9a201..eeb0b2504 100644
--- a/src/newt/classes/com/jogamp/newt/impl/DisplayImpl.java
+++ b/src/newt/classes/com/jogamp/newt/impl/DisplayImpl.java
@@ -78,6 +78,7 @@ public abstract class DisplayImpl extends Display {
             display.name = name;
             display.type=type;
             display.destroyWhenUnused=false;
+            display.refCount=0;
             synchronized(displayList) {
                 display.id = serialno++;
                 display.fqname = getFQName(display.id, display.type, display.name);
@@ -184,6 +185,7 @@ public abstract class DisplayImpl extends Display {
             edtUtil.reset();
         }
         aDevice = null;
+        refCount=0;
         if(DEBUG) {
             dumpDisplayList("Display.destroy("+getFQName()+") END");
         }
diff --git a/src/newt/classes/com/jogamp/newt/impl/WindowImpl.java b/src/newt/classes/com/jogamp/newt/impl/WindowImpl.java
index 3939a12fb..d3ff2e558 100644
--- a/src/newt/classes/com/jogamp/newt/impl/WindowImpl.java
+++ b/src/newt/classes/com/jogamp/newt/impl/WindowImpl.java
@@ -513,13 +513,15 @@ public abstract class WindowImpl implements Window, NEWTEventConsumer
     }
 
     public void destroy(boolean unrecoverable) {
-        if(DEBUG_IMPLEMENTATION) {
-            String msg = new String("Window.destroy(unrecoverable: "+unrecoverable+") START "+getThreadName()/*+", "+this*/);
-            System.err.println(msg);
-            //Exception ee = new Exception(msg);
-            //ee.printStackTrace();
+        if( isValid() ) {
+            if(DEBUG_IMPLEMENTATION) {
+                String msg = new String("Window.destroy(unrecoverable: "+unrecoverable+") START "+getThreadName()/*+", "+this*/);
+                System.err.println(msg);
+                //Exception ee = new Exception(msg);
+                //ee.printStackTrace();
+            }
+            runOnEDTIfAvail(true, new DestroyAction(unrecoverable));
         }
-        runOnEDTIfAvail(true, new DestroyAction(unrecoverable));
     }
 
     class DestroyAction implements Runnable {
@@ -530,6 +532,10 @@ public abstract class WindowImpl implements Window, NEWTEventConsumer
         public void run() {
             windowLock.lock();
             try {
+                if( !isValid() ) {
+                    return; // nop
+                }
+
                 // Childs first ..
                 synchronized(childWindowsLock) {
                   // avoid ConcurrentModificationException: parent -> child -> parent.removeChild(this)