Issue

I see an error page when 2 admin users delete the same item concurrently in page layout view. I don't like this system-error-like view.

ERROR
Cause: javax.portlet.PortletException: Error process faces request
Message: Error process faces request
See log for stacktrace

server.log

19:01:57,991 ERROR [lifecycle] JSF1054: (Phase ID: PROCESS_VALIDATIONS 3, View ID: /jsf/editPageLayout.xhtml) Exception thrown during phase execution: javax.faces.event.PhaseEvent[source=com.sun.faces.lifecycle.LifecycleImpl@25510e56]
19:01:57,991 ERROR [javax_portlet_faces_GenericFacesPortlet] The portlet threw an exception
javax.portlet.PortletException: Error process faces request
     at javax.portlet.faces.GenericFacesPortlet.processAction(GenericFacesPortlet.java:326)
     at org.jboss.portal.portlet.impl.jsr168.PortletContainerImpl$Invoker.doFilter(PortletContainerImpl.java:557)
     at org.jboss.portal.portlet.impl.jsr168.api.FilterChainImpl.doFilter(FilterChainImpl.java:109)
     at org.jboss.portal.portlet.impl.jsr168.api.FilterChainImpl.doFilter(FilterChainImpl.java:72)
     at org.jboss.portal.portlet.impl.jsr168.PortletContainerImpl.dispatch(PortletContainerImpl.java:505)
     at org.jboss.portal.portlet.container.ContainerPortletDispatcher.invoke(ContainerPortletDispatcher.java:42)
     at org.jboss.portal.portlet.PortletInvokerInterceptor.invoke(PortletInvokerInterceptor.java:82)
...
Caused by: java.util.NoSuchElementException
     at javax.faces.component.SelectItemsIterator.next(SelectItemsIterator.java:130)
     at javax.faces.component.SelectItemsIterator.next(SelectItemsIterator.java:157)
     at javax.faces.component.SelectItemsIterator.next(SelectItemsIterator.java:61)
     at javax.faces.component.SelectUtils.matchValue(SelectUtils.java:82)
     at javax.faces.component.UISelectMany.validateValue(UISelectMany.java:465)
     at javax.faces.component.UIInput.validate(UIInput.java:875)
     at javax.faces.component.UIInput.executeValidate(UIInput.java:1072)
     at javax.faces.component.UIInput.processValidators(UIInput.java:672)
     at javax.faces.component.UIForm.processValidators(UIForm.java:235)
     at javax.faces.component.UIComponentBase.processValidators(UIComponentBase.java:1058)
     at javax.faces.component.UIViewRoot.processValidators(UIViewRoot.java:700)
     at com.sun.faces.lifecycle.ProcessValidationsPhase.execute(ProcessValidationsPhase.java:76)
     ... 202 more