Bamboo's activity streams returns 500 Internal Server Error when no builds has been run

From bamboo.log:
2010-06-02 19:22:42,932 ERROR [http-6990-4] [StreamsActivityServlet] Error getting activity
java.lang.RuntimeException: no terms in field completedTimestamp - cannot determine sort type
at org.apache.lucene.search.ExtendedFieldCacheImpl$5.createValue(ExtendedFieldCacheImpl.java:122)
at org.apache.lucene.search.FieldCacheImpl$Cache.get(FieldCacheImpl.java:72)
at org.apache.lucene.search.ExtendedFieldCacheImpl.getAuto(ExtendedFieldCacheImpl.java:110)
at org.apache.lucene.search.FieldSortedHitQueue.comparatorAuto(FieldSortedHitQueue.java:420)
at org.apache.lucene.search.FieldSortedHitQueue$1.createValue(FieldSortedHitQueue.java:185)
at org.apache.lucene.search.FieldCacheImpl$Cache.get(FieldCacheImpl.java:72)
at org.apache.lucene.search.FieldSortedHitQueue.getCachedComparator(FieldSortedHitQueue.java:168)
at org.apache.lucene.search.FieldSortedHitQueue.<init>(FieldSortedHitQueue.java:56)
at org.apache.lucene.search.TopFieldDocCollector.<init>(TopFieldDocCollector.java:43)
at org.apache.lucene.search.IndexSearcher.search(IndexSearcher.java:122)
at org.apache.lucene.search.Hits.getMoreDocs(Hits.java:100)
at org.apache.lucene.search.Hits.<init>(Hits.java:77)
at org.apache.lucene.search.Searcher.search(Searcher.java:55)
at com.atlassian.bamboo.resultsummary.search.IndexedBuildResultsSearcherImpl$1.perform(IndexedBuildResultsSearcherImpl.java:74)
at com.atlassian.bonnie.LuceneConnection.withSearch(LuceneConnection.java:259)
at com.atlassian.bamboo.resultsummary.search.IndexedBuildResultsSearcherImpl.search(IndexedBuildResultsSearcherImpl.java:69)
at com.atlassian.bamboo.build.LuceneBasedJiraIssueResultsManagerImpl.findBuildResultsByProjectKey(LuceneBasedJiraIssueResultsManagerImpl.java:37)
at sun.reflect.GeneratedMethodAccessor241.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:592)
at com.atlassian.plugin.osgi.hostcomponents.impl.DefaultComponentRegistrar$ContextClassLoaderSettingInvocationHandler.invoke(DefaultComponentRegistrar.java:129)
at $Proxy52.findBuildResultsByProjectKey(Unknown Source)
at sun.reflect.GeneratedMethodAccessor241.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:592)
at com.atlassian.plugin.osgi.bridge.external.HostComponentFactoryBean$DynamicServiceInvocationHandler.invoke(HostComponentFactoryBean.java:150)
at $Proxy52.findBuildResultsByProjectKey(Unknown Source)
at com.atlassian.streams.bamboo.BambooStreamsActivityProvider.getActivityFeed(BambooStreamsActivityProvider.java:95)
at com.atlassian.streams.servlet.StreamsActivityServlet$1.doInTransaction(StreamsActivityServlet.java:119)
at com.atlassian.sal.core.transaction.HostContextTransactionTemplate$1.doInTransaction(HostContextTransactionTemplate.java:25)
at com.atlassian.sal.spring.component.SpringHostContextAccessor$1.doInTransaction(SpringHostContextAccessor.java:88)
at org.springframework.transaction.support.TransactionTemplate.execute(TransactionTemplate.java:127)
at com.atlassian.sal.spring.component.SpringHostContextAccessor.doInTransaction(SpringHostContextAccessor.java:82)
at sun.reflect.GeneratedMethodAccessor122.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:592)
at com.atlassian.plugin.osgi.hostcomponents.impl.DefaultComponentRegistrar$ContextClassLoaderSettingInvocationHandler.invoke(DefaultComponentRegistrar.java:129)
at $Proxy83.doInTransaction(Unknown Source)
at sun.reflect.GeneratedMethodAccessor122.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:592)
at com.atlassian.plugin.osgi.bridge.external.HostComponentFactoryBean$DynamicServiceInvocationHandler.invoke(HostComponentFactoryBean.java:150)
at $Proxy83.doInTransaction(Unknown Source)
at com.atlassian.sal.core.transaction.HostContextTransactionTemplate.execute(HostContextTransactionTemplate.java:21)
at sun.reflect.GeneratedMethodAccessor189.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:592)
at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:307)
at org.springframework.osgi.service.importer.support.internal.aop.ServiceInvoker.doInvoke(ServiceInvoker.java:58)
at org.springframework.osgi.service.importer.support.internal.aop.ServiceInvoker.invoke(ServiceInvoker.java:62)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
at org.springframework.aop.support.DelegatingIntroductionInterceptor.doProceed(DelegatingIntroductionInterceptor.java:131)
at org.springframework.aop.support.DelegatingIntroductionInterceptor.invoke(DelegatingIntroductionInterceptor.java:119)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
at org.springframework.osgi.service.util.internal.aop.ServiceTCCLInterceptor.invokeUnprivileged(ServiceTCCLInterceptor.java:56)
at org.springframework.osgi.service.util.internal.aop.ServiceTCCLInterceptor.invoke(ServiceTCCLInterceptor.java:39)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
at org.springframework.osgi.service.importer.support.LocalBundleContextAdvice.invoke(LocalBundleContextAdvice.java:59)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
at org.springframework.aop.support.DelegatingIntroductionInterceptor.doProceed(DelegatingIntroductionInterceptor.java:131)
at org.springframework.aop.support.DelegatingIntroductionInterceptor.invoke(DelegatingIntroductionInterceptor.java:119)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
at $Proxy144.execute(Unknown Source)
at com.atlassian.streams.servlet.StreamsActivityServlet.doGet(StreamsActivityServlet.java:111)