java.util.ConcurrentModificationException: This exception has no message.

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java.util.ConcurrentModificationException:
at java.util.AbstractList$Itr.checkForComodification(Unknown Source)
at java.util.AbstractList$Itr.next(Unknown Source)
at com.atlassian.jira.user.DefaultUserIssueHistoryManager.getViewableIssueHistory(DefaultUserIssueHistoryManager.java:161)
at com.atlassian.jira.user.DefaultUserIssueHistoryManager.getFullIssueHistoryWithPermissionChecks(DefaultUserIssueHistoryManager.java:90)
at com.atlassian.jira.plugin.jql.function.IssueHistoryFunction.getValues(IssueHistoryFunction.java:46)
at com.atlassian.jira.jql.operand.FunctionOperandHandler.getValues(FunctionOperandHandler.java:37)
at com.atlassian.jira.jql.operand.FunctionOperandHandler.getValues(FunctionOperandHandler.java:21)
at com.atlassian.jira.jql.operand.DefaultJqlOperandResolver.getValues(DefaultJqlOperandResolver.java:92)
at com.atlassian.jira.jql.query.IssueIdClauseQueryFactory.getQuery(IssueIdClauseQueryFactory.java:66)
at com.atlassian.jira.jql.query.QueryVisitor.visit(QueryVisitor.java:149)
at com.atlassian.jira.jql.query.QueryVisitor.visit(QueryVisitor.java:25)
at com.atlassian.query.clause.TerminalClauseImpl.accept(TerminalClauseImpl.java:137)
at com.atlassian.jira.jql.query.QueryVisitor.createQuery(QueryVisitor.java:66)
at com.atlassian.jira.jql.query.DefaultLuceneQueryBuilder.createLuceneQuery(DefaultLuceneQueryBuilder.java:34)
at com.atlassian.jira.issue.search.providers.LuceneSearchProvider.getHits(LuceneSearchProvider.java:218)
at com.atlassian.jira.issue.search.providers.LuceneSearchProvider.search(LuceneSearchProvider.java:316)
at com.atlassian.jira.issue.search.providers.LuceneSearchProvider.search(LuceneSearchProvider.java:87)
at com.atlassian.jira.issue.search.providers.LuceneSearchProvider.search(LuceneSearchProvider.java:76)
at com.atlassian.jira.issue.search.providers.LuceneSearchProvider.search(LuceneSearchProvider.java:82)
at com.atlassian.jira.web.action.issue.IssueNavigator.getSearchResults(IssueNavigator.java:1124)
at com.atlassian.jira.web.action.issue.IssueNavigator.executeSearch(IssueNavigator.java:926)
at com.atlassian.jira.web.action.issue.IssueNavigator.showSearchResults(IssueNavigator.java:990)
at com.atlassian.jira.web.action.issue.IssueNavigator._doExecutePopulateFromSearchRequest(IssueNavigator.java:357)
at com.atlassian.jira.web.action.issue.IssueNavigator.doExecute(IssueNavigator.java:221)
at webwork.action.ActionSupport.execute(ActionSupport.java:165)
at com.atlassian.jira.action.JiraActionSupport.execute(JiraActionSupport.java:76)
at webwork.interceptor.DefaultInterceptorChain.proceed(DefaultInterceptorChain.java:39)
at webwork.interceptor.NestedInterceptorChain.proceed(NestedInterceptorChain.java:31)
at webwork.interceptor.ChainedInterceptor.intercept(ChainedInterceptor.java:16)
at webwork.interceptor.DefaultInterceptorChain.proceed(DefaultInterceptorChain.java:35)
at webwork.dispatcher.GenericDispatcher.executeAction(GenericDispatcher.java:205)
at webwork.dispatcher.GenericDispatcher.executeAction(GenericDispatcher.java:143)
at com.atlassian.jira.web.dispatcher.JiraWebworkActionDispatcher.service(JiraWebworkActionDispatcher.java:152)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at com.atlassian.jira.web.filters.steps.ChainedFilterStepRunner.doFilter(ChainedFilterStepRunner.java:74)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at com.atlassian.core.filters.HeaderSanitisingFilter.doFilter(HeaderSanitisingFilter.java:44)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at com.atlassian.plugin.servlet.filter.IteratingFilterChain.doFilter(IteratingFilterChain.java:46)
at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter$1.doFilter(DelegatingPluginFilter.java:66)
at com.atlassian.applinks.core.rest.context.ContextFilter.doFilter(ContextFilter.java:25)
at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter.doFilter(DelegatingPluginFilter.java:74)
at com.atlassian.plugin.servlet.filter.IteratingFilterChain.doFilter(IteratingFilterChain.java:42)
at com.atlassian.plugin.servlet.filter.ServletFilterModuleContainerFilter.doFilter(ServletFilterModuleContainerFilter.java:77)
at com.atlassian.plugin.servlet.filter.ServletFilterModuleContainerFilter.doFilter(ServletFilterModuleContainerFilter.java:63)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at com.atlassian.jira.web.filters.accesslog.AccessLogFilter.executeRequest(AccessLogFilter.java:103)
at com.atlassian.jira.web.filters.accesslog.AccessLogFilter.doFilter(AccessLogFilter.java:87)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at com.atlassian.jira.security.xsrf.XsrfTokenAdditionRequestFilter.doFilter(XsrfTokenAdditionRequestFilter.java:54)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at com.opensymphony.sitemesh.webapp.SiteMeshFilter.obtainContent(SiteMeshFilter.java:129)
at com.atlassian.jira.web.filters.PathExclusionFilter.doFilter(PathExclusionFilter.java:118)
at com.atlassian.core.filters.AbstractHttpFilter.doFilter(AbstractHttpFilter.java:31)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at com.atlassian.plugin.servlet.filter.IteratingFilterChain.doFilter(IteratingFilterChain.java:46)
at com.atlassian.plugin.servlet.filter.ServletFilterModuleContainerFilter.doFilter(ServletFilterModuleContainerFilter.java:77)
at com.atlassian.plugin.servlet.filter.ServletFilterModuleContainerFilter.doFilter(ServletFilterModuleContainerFilter.java:63)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at com.atlassian.seraph.filter.SecurityFilter.doFilter(SecurityFilter.java:211)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at com.atlassian.security.auth.trustedapps.filter.TrustedApplicationsFilter.doFilter(TrustedApplicationsFilter.java:98)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at com.atlassian.seraph.filter.BaseLoginFilter.doFilter(BaseLoginFilter.java:150)
at com.atlassian.jira.web.filters.JiraLoginFilter.doFilter(JiraLoginFilter.java:70)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at com.atlassian.plugin.servlet.filter.IteratingFilterChain.doFilter(IteratingFilterChain.java:46)
at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter$1.doFilter(DelegatingPluginFilter.java:66)
at com.atlassian.oauth.serviceprovider.internal.servlet.OAuthFilter.doFilter(OAuthFilter.java:71)
at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter.doFilter(DelegatingPluginFilter.java:74)
at com.atlassian.plugin.servlet.filter.IteratingFilterChain.doFilter(IteratingFilterChain.java:42)
at com.atlassian.plugin.servlet.filter.ServletFilterModuleContainerFilter.doFilter(ServletFilterModuleContainerFilter.java:77)
at com.atlassian.plugin.servlet.filter.ServletFilterModuleContainerFilter.doFilter(ServletFilterModuleContainerFilter.java:63)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at com.atlassian.util.profiling.filters.ProfilingFilter.doFilter(ProfilingFilter.java:99)
at com.atlassian.jira.web.filters.JIRAProfilingFilter.doFilter(JIRAProfilingFilter.java:19)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at com.atlassian.johnson.filters.AbstractJohnsonFilter.doFilter(AbstractJohnsonFilter.java:71)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at com.atlassian.gzipfilter.GzipFilter.doFilterInternal(GzipFilter.java:81)
at com.atlassian.gzipfilter.GzipFilter.doFilter(GzipFilter.java:51)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at com.atlassian.plugin.servlet.filter.IteratingFilterChain.doFilter(IteratingFilterChain.java:46)
at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter$1.doFilter(DelegatingPluginFilter.java:66)
at com.sysbliss.jira.plugins.workflow.servlet.JWDSendRedirectFilter.doFilter(JWDSendRedirectFilter.java:25)
at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter.doFilter(DelegatingPluginFilter.java:74)
at com.atlassian.plugin.servlet.filter.IteratingFilterChain.doFilter(IteratingFilterChain.java:42)
at com.atlassian.plugin.servlet.filter.ServletFilterModuleContainerFilter.doFilter(ServletFilterModuleContainerFilter.java:77)
at com.atlassian.plugin.servlet.filter.ServletFilterModuleContainerFilter.doFilter(ServletFilterModuleContainerFilter.java:63)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at com.atlassian.jira.web.filters.steps.ChainedFilterStepRunner.doFilter(ChainedFilterStepRunner.java:74)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at com.atlassian.core.filters.cache.AbstractCachingFilter.doFilter(AbstractCachingFilter.java:33)
at com.atlassian.core.filters.AbstractHttpFilter.doFilter(AbstractHttpFilter.java:31)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at com.atlassian.core.filters.encoding.AbstractEncodingFilter.doFilter(AbstractEncodingFilter.java:41)
at com.atlassian.core.filters.AbstractHttpFilter.doFilter(AbstractHttpFilter.java:31)
at com.atlassian.jira.web.filters.PathMatchingEncodingFilter.doFilter(PathMatchingEncodingFilter.java:49)
at com.atlassian.core.filters.AbstractHttpFilter.doFilter(AbstractHttpFilter.java:31)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at com.atlassian.jira.web.monitor.ActiveRequestsFilter$PassToChainFilterFunc.doFilter(ActiveRequestsFilter.java:346)
at com.atlassian.jira.web.monitor.ActiveRequestsFilter$DebugLogFilterFunc.doFilter(ActiveRequestsFilter.java:463)
at com.atlassian.jira.web.monitor.ActiveRequestsFilter.doFilter(ActiveRequestsFilter.java:173)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at com.atlassian.jira.startup.JiraStartupChecklistFilter.doFilter(JiraStartupChecklistFilter.java:75)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at com.atlassian.multitenant.servlet.MultiTenantServletFilter.doFilter(MultiTenantServletFilter.java:91)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at com.atlassian.jira.web.filters.steps.ChainedFilterStepRunner.doFilter(ChainedFilterStepRunner.java:74)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:554)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:859)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
at java.lang.Thread.run(Unknown Source)

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