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When I delete a testCase , I met a exception

xinl

First , I bulk import some testCases and testFolders into JIRA

The testFolder have a link to testCase.

And later , I bulk delete some testFolder in jira.

Now , I meet an issue :

when I want to delete a testCse , I met a exception below :

java.lang.NullPointerException

java.lang.NullPointerException
	at com.atlassian.jira.issue.IssueFactory$1.transform(IssueFactory.java:79)
	at org.apache.commons.collections.CollectionUtils.collect(CollectionUtils.java:632)
	at org.apache.commons.collections.CollectionUtils.collect(CollectionUtils.java:610)
	at org.apache.commons.collections.CollectionUtils.collect(CollectionUtils.java:575)
	at com.atlassian.jira.issue.index.DefaultIndexManager.reIndexIssueObjects(DefaultIndexManager.java:362)
	at com.atlassian.jira.issue.index.DefaultIndexManager.reIndex(DefaultIndexManager.java:382)
	at com.atlassian.jira.issue.index.DefaultIndexManager.reIndex(DefaultIndexManager.java:375)
	at sun.reflect.GeneratedMethodAccessor1258.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.lang.reflect.Method.invoke(Unknown Source)
	at com.atlassian.util.profiling.object.ObjectProfiler.profiledInvoke(ObjectProfiler.java:83)
	at com.atlassian.jira.config.component.SwitchingInvocationHandler.invoke(SwitchingInvocationHandler.java:28)
	at com.sun.proxy.$Proxy131.reIndex(Unknown Source)
	at com.atlassian.jira.issue.link.DefaultIssueLinkManager.reindexLinkedIssues(DefaultIssueLinkManager.java:149)
	at com.atlassian.jira.issue.link.DefaultIssueLinkManager.removeIssueLinkInternal(DefaultIssueLinkManager.java:240)
	at com.atlassian.jira.issue.link.DefaultIssueLinkManager.deleteIssueLinksFromIssue(DefaultIssueLinkManager.java:332)
	at com.atlassian.jira.issue.link.DefaultIssueLinkManager.removeIssueLinksInternal(DefaultIssueLinkManager.java:311)
	at com.atlassian.jira.issue.link.DefaultIssueLinkManager.removeIssueLinksNoChangeItems(DefaultIssueLinkManager.java:288)
	at com.atlassian.jira.issue.managers.DefaultIssueDeleteHelper.removeIssueLinks(DefaultIssueDeleteHelper.java:177)
	at com.atlassian.jira.issue.managers.DefaultIssueDe