fix

jme3-lwjgl3/src/main/java/com/jme3/system/lwjglx/Win32GLPlatform.java

@@ -42,7 +42,17 @@ import org.lwjgl.opengl.awt.PlatformWin32GLCanvas;
  */
 final class Win32GLPlatform extends PlatformWin32GLCanvas implements LwjglxGLPlatform {
 
-    /**
+    /* (non-Javadoc)
+     * @see com.jme3.system.lwjglx.LwjglxGLPlatform#dispose()
+     */
+    @Override
+    public void dispose() {
+        if (ds != null) {
+            super.dispose();
+        }
+    }
+
+    /*
      * (non-Javadoc)
      * @see com.jme3.system.lwjglx.LwjglxGLPlatform#destroy() 
      */