Alerts History view on Overview page in JON fails to display alert history due to PageControlView[SubsystemAlertHistoryUIBean] receiving a NullPointerException

ERROR [org.rhq.enterprise.gui.common.paging.PagedListDataModel] PageControlView[SubsystemAlertHistoryUIBean]: Received error[java.lang.NullPointerException], resetting to PageControl[page=0, size=45]
ERROR [org.rhq.enterprise.gui.common.paging.PagedListDataModel] Could not retrieve collection for PageControlView[SubsystemAlertHistoryUIBean]
javax.ejb.EJBException: java.lang.NullPointerException
     at org.jboss.ejb3.tx.Ejb3TxPolicy.handleExceptionInOurTx(Ejb3TxPolicy.java:63)
     at org.jboss.aspects.tx.TxPolicy.invokeInOurTx(TxPolicy.java:83)
     at org.jboss.aspects.tx.TxInterceptor$Required.invoke(TxInterceptor.java:191)
     ...
     at org.jboss.ejb3.stateless.StatelessLocalProxy.invoke(StatelessLocalProxy.java:84)
     at $Proxy333.disambiguate(Unknown Source)
     at org.rhq.enterprise.gui.common.paging.ResourceNameDisambiguatingPagedListDataModel.fetchPage(ResourceNameDisambiguatingPagedListDataModel.java:69)
     at org.rhq.enterprise.gui.common.paging.PagedListDataModel.fetchPageGuarded(PagedListDataModel.java:388)
     at org.rhq.enterprise.gui.common.paging.PagedListDataModel.getDataPage(PagedListDataModel.java:296)
     at org.rhq.enterprise.gui.common.paging.PagedListDataModel.getPage(PagedListDataModel.java:125)
     at org.rhq.enterprise.gui.common.paging.PagedListDataModel.getRowCount(PagedListDataModel.java:111)
     at org.ajax4jsf.model.SequenceDataModel.getRowCount(SequenceDataModel.java:139)
     ...
     at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:157)
     at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
     at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:262)
     at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
     at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
     at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:446)
     at java.lang.Thread.run(Thread.java:619)
Caused by: java.lang.NullPointerException
     at org.rhq.enterprise.server.resource.disambiguation.DefaultDisambiguationUpdateStrategies.updateResources(DefaultDisambiguationUpdateStrategies.java:151)
     at org.rhq.enterprise.server.resource.disambiguation.DefaultDisambiguationUpdateStrategies$4.update(DefaultDisambiguationUpdateStrategies.java:103)
     at org.rhq.enterprise.server.resource.disambiguation.Disambiguator.repartitionUnique(Disambiguator.java:271)
     at org.rhq.enterprise.server.resource.disambiguation.Disambiguator.disambiguate(Disambiguator.java:231)
     at org.rhq.enterprise.server.resource.ResourceManagerBean.disambiguate(ResourceManagerBean.java:2134)
     at sun.reflect.GeneratedMethodAccessor333.invoke(Unknown Source)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     at java.lang.reflect.Method.invoke(Method.java:597)
     at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:112)
     at org.jboss.ejb3.interceptor.InvocationContextImpl.proceed(InvocationContextImpl.java:166)
     at org.rhq.enterprise.server.common.TransactionInterruptInterceptor.addCheckedActionToTransactionManager(TransactionInterruptInterceptor.java:77)
     at sun.reflect.GeneratedMethodAccessor100.invoke(Unknown Source)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     at java.lang.reflect.Method.invoke(Method.java:597)
     at org.jboss.ejb3.interceptor.InvocationContextImpl.proceed(InvocationContextImpl.java:118)
     at org.rhq.enterprise.server.authz.RequiredPermissionsInterceptor.checkRequiredPermissions(RequiredPermissionsInterceptor.java:156)
     at sun.reflect.GeneratedMethodAccessor99.invoke(Unknown Source)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     at java.lang.reflect.Method.invoke(Method.java:597)
     at org.jboss.ejb3.interceptor.InvocationContextImpl.proceed(InvocationContextImpl.java:118)
     at org.jboss.ejb3.interceptor.EJB3InterceptorsInterceptor.invoke(EJB3InterceptorsInterceptor.java:63)
     at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
     at org.jboss.ejb3.entity.TransactionScopedEntityManagerInterceptor.invoke(TransactionScopedEntityManagerInterceptor.java:54)
     at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
     at org.jboss.ejb3.AllowedOperationsInterceptor.invoke(AllowedOperationsInterceptor.java:47)
     at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
     at org.jboss.aspects.tx.TxPolicy.invokeInOurTx(TxPolicy.java:79)
     ... 91 more