XMLEscapeUtil fails with nullpointerexception on XML Import

2013-05-02 00:39:22,982 JiraImportTaskExecutionThread-1 ERROR anonymous 39x29x1 wox8nj 172.17.40.109,10.24.25.29 /secure/SetupImport.jspa [jira.bc.dataimport.DefaultDataImportService] Error importing data: java.lang.NullPointerException
java.lang.NullPointerException
	at java.util.AbstractCollection.addAll(AbstractCollection.java:333)
	at com.atlassian.jira.imports.project.util.XMLEscapeUtil.unicodeInPlaceEncode(XMLEscapeUtil.java:201)
	at com.atlassian.jira.imports.project.util.XMLEscapeUtil.unicodeInPlaceEncode(XMLEscapeUtil.java:154)
	at com.atlassian.jira.util.xml.XMLEscapingReader.read(XMLEscapingReader.java:66)
	at org.apache.xerces.impl.XMLEntityScanner.load(Unknown Source)
	at org.apache.xerces.impl.XMLEntityScanner.peekChar(Unknown Source)
	at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanCDATASection(Unknown Source)
	at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown Source)
	at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
	at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
	at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
	at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
	at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
	at org.apache.xerces.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown Source)
	at com.atlassian.jira.bc.dataimport.DefaultDataImportService.parseXmlAndValidateBackupData(DefaultDataImportService.java:303)
	at com.atlassian.jira.bc.dataimport.DefaultDataImportService.doImport(DefaultDataImportService.java:233)
	at com.atlassian.jira.web.action.setup.DataImportAsyncCommand.call(DataImportAsyncCommand.java:65)
	at com.atlassian.jira.web.action.setup.DataImportAsyncCommand.call(DataImportAsyncCommand.java:28)
	at com.atlassian.jira.task.ImportTaskManagerImpl$TaskCallableDecorator.call(ImportTaskManagerImpl.java:147)
	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
	at java.util.concurrent.FutureTask.run(FutureTask.java:166)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
	at java.util.concurrent.FutureTask.run(FutureTask.java:166)
	at com.atlassian.multitenant.impl.DefaultMultiTenantManager.runForTenant(DefaultMultiTenantManager.java:61)
	at com.atlassian.multitenant.juc.MultiTenantExecutors$WrappedRunnable.run(MultiTenantExecutors.java:160)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
	at java.lang.Thread.run(Thread.java:722)