1 files changed, 4 insertions, 1 deletions
diff --git a/src/newt/classes/jogamp/newt/driver/macosx/MacWindow.java b/src/newt/classes/jogamp/newt/driver/macosx/MacWindow.java
index b45c60e69..942994c13 100644
--- a/src/newt/classes/jogamp/newt/driver/macosx/MacWindow.java
+++ b/src/newt/classes/jogamp/newt/driver/macosx/MacWindow.java
@@ -104,7 +104,10 @@ public class MacWindow extends WindowImpl implements SurfaceChangeable, DriverCl
     @Override
     protected void unlockSurfaceImpl() {
         if(!isOffscreenInstance) {
-            unlockSurface0(getWindowHandle());
+            final long h = getWindowHandle();
+            if(0 != h) {
+                unlockSurface0(h);
+            }
         }
     }