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

*** 351,360 ****
--- 351,363 ----
              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);