src/java.desktop/unix/classes/sun/awt/X11/XFramePeer.java

@@ -351,10 +351,13 @@
             topLevelListenerTmp.stateChangedJava(oldState, newState);
         }
     }
 
     public void setVisible(boolean vis) {
+        if (isDisposed()) {
+            return;
+        }
         if (vis) {
             setupState(false);
         } else {
             if ((state & Frame.MAXIMIZED_BOTH) != 0) {
                 XWM.getWM().setExtendedState(this, state & ~Frame.MAXIMIZED_BOTH);