1 files changed, 4 insertions, 2 deletions
diff --git a/src/jogl/classes/javax/media/opengl/awt/GLCanvas.java b/src/jogl/classes/javax/media/opengl/awt/GLCanvas.java
index e5f39e5de..3877a7997 100644
--- a/src/jogl/classes/javax/media/opengl/awt/GLCanvas.java
+++ b/src/jogl/classes/javax/media/opengl/awt/GLCanvas.java
@@ -1024,7 +1024,9 @@ public class GLCanvas extends Canvas implements AWTGLAutoDrawable, WindowClosing
         final RecursiveLock _lock = lock;
         _lock.lock();
         try {
-            helper.invokeGL(drawable, context, displayAction, initAction);
+            if( drawable.isRealized() ) {
+                helper.invokeGL(drawable, context, displayAction, initAction);
+            }
         } finally {
             _lock.unlock();
         }
@@ -1037,7 +1039,7 @@ public class GLCanvas extends Canvas implements AWTGLAutoDrawable, WindowClosing
         final RecursiveLock _lock = lock;
         _lock.lock();
         try {
-            if(null != drawable) {
+            if(null != drawable && drawable.isRealized() ) {
                 drawable.swapBuffers();
             }
         } finally {