When securing the <navigation> with a permission that the user does not own, an NPE is thrown:
java.lang.NullPointerException at org.appng.api.support.ElementHelper.initNavigation(ElementHelper.java:199) at org.appng.core.model.ApplicationProvider.process(ApplicationProvider.java:276) at org.appng.core.model.AbstractRequestProcessor.processApplication(AbstractRequestProcessor.java:264) at org.appng.core.model.AbstractRequestProcessor.processPlatform(AbstractRequestProcessor.java:160) at org.appng.core.model.PlatformProcessor.processWithTemplate(PlatformProcessor.java:87) at org.appng.core.controller.handler.GuiHandler.processGui(GuiHandler.java:148) at org.appng.core.controller.handler.GuiHandler.handle(GuiHandler.java:71) at org.appng.core.controller.Controller.doGet(Controller.java:276)