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java.lang.NullPointerException
java.lang.NullPointerException: null	at org.owasp.dependencycheck.dependency.Reference.compareTo(Reference.java:144)	at org.owasp.dependencycheck.dependency.Reference.compareTo(Reference.java:28)	at java.util.TreeMap.compare(TreeMap.java:1290)	at java.util.TreeMap.put(TreeMap.java:538)	at java.util.TreeSet.add(TreeSet.java:255)	at org.owasp.dependencycheck.dependency.Vulnerability.addReference(Vulnerability.java:110)	at org.owasp.dependencycheck.data.update.nvd.NvdCve20Handler.endElement(NvdCve20Handler.java:205)	at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.endElement(AbstractSAXParser.java:609)	at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanEndElement(XMLDocumentFragmentScannerImpl.java:1783)	at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(XMLDocumentFragmentScannerImpl.java:2970)	at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:606)	at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:510)	at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:848)	at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:777)	at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:141)	at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1213)	at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:643)	at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl.parse(SAXParserImpl.java:327)	at javax.xml.parsers.SAXParser.parse(SAXParser.java:328)	at org.owasp.dependencycheck.data.update.nvd.ProcessTask.importXML(ProcessTask.java:150)	at org.owasp.dependencycheck.data.update.nvd.ProcessTask.processFiles(ProcessTask.java:162)	at org.owasp.dependencycheck.data.update.nvd.ProcessTask.call(ProcessTask.java:116)	at org.owasp.dependencycheck.data.update.nvd.ProcessTask.call(ProcessTask.java:45)	at java.util.concurrent.FutureTask.run(FutureTask.java:266)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)	at java.lang.Thread.run(Thread.java:745)