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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:136) at com.atlassian.jira.user.DefaultUserIssueHistoryManager.getFullIssueHistoryWithPermissionChecks(DefaultUserIssueHistoryManager.java:73) 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)