NPE happened when I did sanity testing of the MenuDemo on Mac

sh run-sanity.sh

----- HelloSanity -----
java @/data/projects/graphics/rt-closed/toys/../../rt/build/run.args -ea -DproxyHost=www-proxy.us.oracle.com -DproxyPort=80 -cp dist/Hello.jar hello.HelloSanity
Picked up _JAVA_OPTIONS: -Dsun.reflect.debugModuleAccessChecks=true --add-opens=java.base/java.lang=ALL-UNNAMED --add-opens=java.base/java.util=ALL-UNNAMED --add-opens=java.base/java.lang.invoke=ALL-UNNAMED --add-opens=java.base/java.io=ALL-UNNAMED --add-opens=java.base/java.util.concurrent=ALL-UNNAMED --add-opens=java.base/java.text=ALL-UNNAMED
MenuItem "foo" is now not visible.
Simple Button
Exception in thread "JavaFX Application Thread" java.lang.NullPointerException
at javafx.controls/javafx.scene.control.skin.MenuButtonSkinBase.lambda$new$7(MenuButtonSkinBase.java:188)
at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$9(PlatformImpl.java:418)
at java.base/java.security.AccessController.doPrivileged(Native Method)
at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$10(PlatformImpl.java:417)
at javafx.graphics/com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:96)