discussion

java.util.NoSuchElementException: No value present
at java.base/java.util.Optional.get(Optional.java:148)
at ru.simplex_software.discussion.web.components.TopicsTreePanel$ClickableFolder.onClick(TopicsTreePanel.java:402)
at org.apache.wicket.extensions.markup.html.repeater.tree.content.StyledLinkLabel$1.onClick(StyledLinkLabel.java:91)
at org.apache.wicket.ajax.markup.html.AjaxFallbackLink.onClick(AjaxFallbackLink.java:122)
at org.apache.wicket.markup.html.link.Link.onRequest(Link.java:191)
at org.apache.wicket.core.request.handler.ListenerRequestHandler.internalInvoke(ListenerRequestHandler.java:300)
at org.apache.wicket.core.request.handler.ListenerRequestHandler.invoke(ListenerRequestHandler.java:249)
at org.apache.wicket.core.request.handler.ListenerRequestHandler.invokeListener(ListenerRequestHandler.java:209)
at org.apache.wicket.core.request.handler.ListenerRequestHandler.respond(ListenerRequestHandler.java:202)
at org.apache.wicket.request.cycle.RequestCycle$HandlerExecutor.respond(RequestCycle.java:910)
at org.apache.wicket.request.RequestHandlerExecutor.execute(RequestHandlerExecutor.java:63)
at org.apache.wicket.request.cycle.RequestCycle.execute(RequestCycle.java:294)
at org.apache.wicket.request.cycle.RequestCycle.processRequest(RequestCycle.java:255)
at org.apache.wicket.protocol.http.WicketFilter.processRequestCycle(WicketFilter.java:277)
at org.apache.wicket.protocol.ws.AbstractUpgradeFilter.processRequestCycle(AbstractUpgradeFilter.java:67)
at org.apache.wicket.protocol.http.WicketFilter.processRequest(WicketFilter.java:208)
at org.apache.wicket.protocol.http.WicketFilter.doFilter(WicketFilter.java:307)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at ru.simplex_software.discussion.OnlineFilter.doFilter(OnlineFilter.java:41)
at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:354)
at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:267)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)