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java.util.ConcurrentModificationException: 	at java.util.AbstractList$Itr.checkForComodification(AbstractList.java:372)	at java.util.AbstractList$Itr.next(AbstractList.java:343)	at java.util.Collections$UnmodifiableCollection$1.next(Collections.java:1010)	at com.atlassian.jira.user.DefaultUserIssueHistoryManager.getViewableIssueHistory(DefaultUserIssueHistoryManager.java:133)	at com.atlassian.jira.user.DefaultUserIssueHistoryManager.getFullIssueHistoryWithPermissionChecks(DefaultUserIssueHistoryManager.java:74)	at com.atlassian.jira.plugin.jql.function.IssueHistoryFunction.getValues(IssueHistoryFunction.java:46)	at com.atlassian.jira.jql.operand.FunctionOperandHandler.getValues(FunctionOperandHandler.java:35)	at com.atlassian.jira.jql.operand.FunctionOperandHandler.getValues(FunctionOperandHandler.java:19)	at com.atlassian.jira.jql.operand.DefaultJqlOperandResolver.getValues(DefaultJqlOperandResolver.java:83)	at com.atlassian.jira.jql.query.IssueIdClauseQueryFactory.getQuery(IssueIdClauseQueryFactory.java:65)	at com.atlassian.jira.jql.query.QueryVisitor.visit(QueryVisitor.java:147)	at com.atlassian.jira.jql.query.QueryVisitor.visit(QueryVisitor.java:23)	at com.atlassian.query.clause.TerminalClauseImpl.accept(TerminalClauseImpl.java:137)	at com.atlassian.jira.jql.query.QueryVisitor.createQuery(QueryVisitor.java:64)	at com.atlassian.jira.jql.query.DefaultLuceneQueryBuilder.createLuceneQuery(DefaultLuceneQueryBuilder.java:34)	at com.atlassian.jira.issue.search.providers.LuceneSearchProvider.getHits(LuceneSearchProvider.java:151)	at com.atlassian.jira.issue.search.providers.LuceneSearchProvider.search(LuceneSearchProvider.java:238)	at com.atlassian.jira.issue.search.providers.LuceneSearchProvider.search(LuceneSearchProvider.java:80)	at com.atlassian.jira.bc.issue.search.AbstractIssuePickerSearchProvider.getResults(AbstractIssuePickerSearchProvider.java:85)	at com.atlassian.jira.bc.issue.search.DefaultIssuePickerSearchService.getResults(DefaultIssuePickerSearchService.java:61)	at sun.reflect.GeneratedMethodAccessor612.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:597)	at com.atlassian.plugin.osgi.hostcomponents.impl.DefaultComponentRegistrar$ContextClassLoaderSettingInvocationHandler.invoke(DefaultComponentRegistrar.java:129)