Console does not save changes in hap enterprise

Root cause:

org.apache.wicket.core.request.handler.ComponentNotFoundException: Component 'dialog:content:form:buttons:1:button' has been removed from page.
     at org.apache.wicket.core.request.handler.ListenerInterfaceRequestHandler.respond(ListenerInterfaceRequestHandler.java:177)
     at org.apache.wicket.request.cycle.RequestCycle$HandlerExecutor.respond(RequestCycle.java:895)
     at org.apache.wicket.request.RequestHandlerStack.execute(RequestHandlerStack.java:64)
     at org.apache.wicket.request.cycle.RequestCycle.execute(RequestCycle.java:265)
     at org.apache.wicket.request.cycle.RequestCycle.processRequest(RequestCycle.java:222)
     at org.apache.wicket.request.cycle.RequestCycle.processRequestAndDetach(RequestCycle.java:293)
     at org.apache.wicket.protocol.http.WicketFilter.processRequestCycle(WicketFilter.java:261)
     at org.apache.wicket.protocol.http.WicketFilter.processRequest(WicketFilter.java:203)
     at org.apache.wicket.protocol.http.WicketFilter.doFilter(WicketFilter.java:284)
     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
     at org.apache.wicket.protocol.http.WicketFilter.processRequestCycle(WicketFilter.java:269)
     at org.apache.wicket.protocol.http.WicketFilter.processRequest(WicketFilter.java:203)
     at org.apache.wicket.protocol.http.WicketFilter.doFilter(WicketFilter.java:284)
     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
     at org.hippoecm.frontend.plugins.login.ConcurrentLoginFilter.doFilter(ConcurrentLoginFilter.java:54)
     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
     at org.hippoecm.hst.core.container.FilterChainInvokingValve.invoke(FilterChainInvokingValve.java:72)
     at org.hippoecm.hst.core.container.HstSitePipeline$Invocation.invokeNext(HstSitePipeline.java:288)
     at org.hippoecm.hst.core.container.JCRSessionStatefulConcurrencyValve.invoke(JCRSessionStatefulConcurrencyValve.java:56)
     at org.hippoecm.hst.core.container.HstSitePipeline$Invocation.invokeNext(HstSitePipeline.java:288)
     at org.hippoecm.hst.core.container.SubjectBasedSessionValve.invoke(SubjectBasedSessionValve.java:58)
     at org.hippoecm.hst.core.container.HstSitePipeline$Invocation.invokeNext(HstSitePipeline.java:288)
     at org.hippoecm.hst.core.container.SecurityValve.invoke(SecurityValve.java:177)
     at org.hippoecm.hst.core.container.HstSitePipeline$Invocation.invokeNext(HstSitePipeline.java:288)
     at org.hippoecm.hst.core.container.LocalizationValve.invoke(LocalizationValve.java:101)
     at org.hippoecm.hst.core.container.HstSitePipeline$Invocation.invokeNext(HstSitePipeline.java:288)
     at org.hippoecm.hst.core.container.CmsSecurityValve.invoke(CmsSecurityValve.java:60)
     at org.hippoecm.hst.core.container.HstSitePipeline$Invocation.invokeNext(HstSitePipeline.java:288)
     at org.hippoecm.hst.core.container.InitializationValve.invoke(InitializationValve.java:40)
     at org.hippoecm.hst.core.container.HstSitePipeline$Invocation.invokeNext(HstSitePipeline.java:288)
     at org.hippoecm.hst.core.container.HstSitePipeline.invokeValves(HstSitePipeline.java:173)
     at org.hippoecm.hst.core.container.HstSitePipeline.invoke(HstSitePipeline.java:155)
     at org.hippoecm.hst.core.container.HstRequestProcessorImpl.processRequest(HstRequestProcessorImpl.java:81)
     at org.hippoecm.hst.container.HstDelegateeFilterBean.doFilter(HstDelegateeFilterBean.java:497)
     at org.hippoecm.hst.container.DelegatingFilter.doFilter(DelegatingFilter.java:68)
     at org.hippoecm.hst.container.HstFilter.doFilter(HstFilter.java:51)
     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
     at org.onehippo.cms7.utilities.servlet.ProxyFilter.doFilter(ProxyFilter.java:126)
     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:202)
     at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
     at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:526)
     at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139)
     at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
     at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:678)
     at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74)
     at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
     at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:408)
     at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
     at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:860)
     at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1589)
     at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
     at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
     at java.lang.Thread.run(Thread.java:748)