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java.lang.NullPointerException: 	at org.pdfbox.pdmodel.PDPageNode.getAllKids(PDPageNode.java:194)	at org.pdfbox.pdmodel.PDPageNode.getAllKids(PDPageNode.java:182)	at org.pdfbox.pdmodel.PDDocumentCatalog.getAllPages(PDDocumentCatalog.java:162)	at org.pdfbox.util.PDFTextStripper.writeText(PDFTextStripper.java:220)	at com.atlassian.bonnie.search.extractor.PdfContentExtractor.extractText(PdfContentExtractor.java:50)	at com.atlassian.bonnie.search.extractor.BaseAttachmentContentExtractor.addFields(BaseAttachmentContentExtractor.java:40)	at com.atlassian.confluence.plugin.descriptor.ExtractorModuleDescriptor$BackwardsCompatibleExtractor.addFields(ExtractorModuleDescriptor.java:45)	at com.atlassian.bonnie.search.BaseDocumentBuilder.getDocument(BaseDocumentBuilder.java:104)	at com.atlassian.confluence.search.lucene.ConfluenceDocumentBuilder.getDocument(ConfluenceDocumentBuilder.java:102)	at com.atlassian.confluence.search.lucene.tasks.AddDocumentIndexTask.perform(AddDocumentIndexTask.java:43)	at com.atlassian.confluence.search.lucene.tasks.UpdateDocumentIndexTask.perform(UpdateDocumentIndexTask.java:40)	at com.atlassian.confluence.search.lucene.tasks.BulkWriteIndexTask.perform(BulkWriteIndexTask.java:44)	at com.atlassian.bonnie.LuceneConnection.withWriter(LuceneConnection.java:331)	at com.atlassian.confluence.search.lucene.tasks.LuceneConnectionBackedIndexTaskPerformer.perform(LuceneConnectionBackedIndexTaskPerformer.java:20)	at com.atlassian.confluence.search.lucene.DefaultConfluenceIndexManager$BatchUpdateAction.perform(DefaultConfluenceIndexManager.java:344)	at com.atlassian.bonnie.LuceneConnection.withBatchUpdate(LuceneConnection.java:405)	at com.atlassian.confluence.search.lucene.DefaultConfluenceIndexManager.processTasks(DefaultConfluenceIndexManager.java:143)	at com.atlassian.confluence.search.lucene.DefaultConfluenceIndexManager.flushQueue(DefaultConfluenceIndexManager.java:109)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:597)	at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:304)	at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:182)	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:149)	at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:106)	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)	at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)	at $Proxy36.flushQueue(Unknown Source)	at com.atlassian.confluence.search.lucene.IndexQueueFlusher.executeJob(IndexQueueFlusher.java:29)	at com.atlassian.confluence.setup.quartz.AbstractClusterAwareQuartzJobBean.surroundJobExecutionWithLogging(AbstractClusterAwareQuartzJobBean.java:63)	at com.atlassian.confluence.setup.quartz.AbstractClusterAwareQuartzJobBean.executeInternal(AbstractClusterAwareQuartzJobBean.java:46)	at org.springframework.scheduling.quartz.QuartzJobBean.execute(QuartzJobBean.java:86)	at org.quartz.core.JobRunShell.run(JobRunShell.java:202)	at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:525)