Updating admin group causes NPE

2018-06-26 13:38:07,834 ERROR model.ApplicationProvider : [manager:appng-manager] error while building structure for page 'users'
org.appng.api.ProcessingException: error performing action 'updateGroup' of event 'groupEvent', ID: 23512194
at org.appng.api.support.CallableAction.execute(CallableAction.java:438)
at org.appng.api.support.CallableAction.perform(CallableAction.java:319)
at org.appng.core.model.ActionElement.perform(ActionElement.java:72)
at org.appng.core.model.ApplicationProvider.getActionSectionElement(ApplicationProvider.java:533)
at org.appng.core.model.ApplicationProvider.access$000(ApplicationProvider.java:126)
at org.appng.core.model.ApplicationProvider$2.perform(ApplicationProvider.java:424)
at org.appng.core.model.ApplicationProvider.doMonitored(ApplicationProvider.java:468)
at org.appng.core.model.ApplicationProvider.addElements(ApplicationProvider.java:432)
at org.appng.core.model.ApplicationProvider.buildStructure(ApplicationProvider.java:351)
at org.appng.core.model.ApplicationProvider.process(ApplicationProvider.java:280)
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:280)
at org.apache.catalina.servlets.DefaultServlet.doPost(DefaultServlet.java:520)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:661)
at org.apache.catalina.servlets.DefaultServlet.service(DefaultServlet.java:418)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.appng.core.controller.filter.JspExtensionFilter.doFilter(JspExtensionFilter.java:120)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.tuckey.web.filters.urlrewrite.RuleChain.handleRewrite(RuleChain.java:176)
at org.tuckey.web.filters.urlrewrite.RuleChain.doRules(RuleChain.java:145)
at org.tuckey.web.filters.urlrewrite.UrlRewriter.processRequest(UrlRewriter.java:92)
at org.tuckey.web.filters.urlrewrite.UrlRewriteFilter.doFilter(UrlRewriteFilter.java:389)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.appng.core.controller.filter.PageCacheFilter.doFilter(PageCacheFilter.java:108)
at net.sf.ehcache.constructs.web.filter.Filter.doFilter(Filter.java:86)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.appng.core.controller.filter.XSSFilter.doFilter(XSSFilter.java:86)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:478)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:80)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:650)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342)
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:799)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1457)
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.NullPointerException
at org.appng.api.support.FieldProcessorImpl.addErrorMessage(FieldProcessorImpl.java:150)
at org.appng.application.manager.service.ManagerService.checkUniqueGroupName(ManagerService.java:294)
at org.appng.application.manager.service.ManagerService.updateGroup(ManagerService.java:282)
at org.appng.application.manager.service.ManagerService$$FastClassBySpringCGLIB$$bbf10b1e.invoke(<generated>)
at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204)
at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:738)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157)
at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:99)
at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:282)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:673)
at org.appng.application.manager.service.ManagerService$$EnhancerBySpringCGLIB$$81b4de0b_10.updateGroup(<generated>)
at org.appng.application.manager.business.Groups.perform(Groups.java:66)
at org.appng.application.manager.business.Groups.perform(Groups.java:46)
at org.appng.api.support.CallableAction.execute(CallableAction.java:420)
... 57 more