java.lang.NullPointerException: This exception has no message.

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This exception has no message.
java.lang.NullPointerException:
at com.intellij.codeInspection.ui.InspectionResultsViewComparator.b(InspectionResultsViewComparator.java:163)
at com.intellij.codeInspection.ui.InspectionResultsViewComparator.compare(InspectionResultsViewComparator.java:90)
at com.intellij.util.ui.tree.TreeUtil.indexedBinarySearch(TreeUtil.java:985)
at com.intellij.codeInspection.ui.InspectionTreeNode.a(InspectionTreeNode.java:112)
at com.intellij.openapi.application.ReadAction.compute(ReadAction.java:52)
at com.intellij.codeInspection.ui.InspectionTreeNode.insertByOrder(InspectionTreeNode.java:105)
at com.intellij.codeInspection.ui.RefElementNode.insertByOrder(RefElementNode.java:102)
at com.intellij.codeInspection.ex.InspectionRVContentProvider$2.accept(InspectionRVContentProvider.java:333)
at com.intellij.util.ui.tree.TreeUtil.traverseDepth(TreeUtil.java:360)
at com.intellij.util.ui.tree.TreeUtil.traverseDepth(TreeUtil.java:363)
at com.intellij.codeInspection.ex.InspectionRVContentProvider.addNodeToParent(InspectionRVContentProvider.java:320)
at com.intellij.codeInspection.ex.InspectionRVContentProviderImpl.appendDescriptor(InspectionRVContentProviderImpl.java:147)
at com.intellij.codeInspection.ex.InspectionRVContentProvider.buildTree(InspectionRVContentProvider.java:249)
at com.intellij.codeInspection.ex.InspectionRVContentProviderImpl.appendToolNodeContent(InspectionRVContentProviderImpl.java:109)
at com.intellij.codeInspection.ex.InspectionRVContentProvider.appendToolNodeContent(InspectionRVContentProvider.java:147)
at com.intellij.codeInspection.ui.InspectionResultsView.addTool(InspectionResultsView.java:646)
at com.intellij.codeInspection.ui.InspectionResultsView.addTools(InspectionResultsView.java:766)
at com.intellij.codeInspection.ex.GlobalInspectionContextImpl.a(GlobalInspectionContextImpl.java:662)
at com.intellij.codeInspection.ex.GlobalInspectionContextImpl.runTools(GlobalInspectionContextImpl.java:391)
at com.intellij.codeInspection.ex.GlobalInspectionContextBase.a(GlobalInspectionContextBase.java:279)
at com.intellij.openapi.progress.impl.CoreProgressManager.a(CoreProgressManager.java:568)
at com.intellij.openapi.progress.impl.CoreProgressManager.executeProcessUnderProgress(CoreProgressManager.java:519)
at com.intellij.openapi.progress.impl.ProgressManagerImpl.executeProcessUnderProgress(ProgressManagerImpl.java:54)
at com.intellij.codeInspection.ex.GlobalInspectionContextBase.performInspectionsWithProgress(GlobalInspectionContextBase.java:279)
at com.intellij.codeInspection.ex.GlobalInspectionContextBase$3.run(GlobalInspectionContextBase.java:236)
at com.intellij.openapi.progress.impl.CoreProgressManager$TaskRunnable.run(CoreProgressManager.java:710)
at com.intellij.openapi.progress.impl.CoreProgressManager$3.run(CoreProgressManager.java:179)
at com.intellij.openapi.progress.impl.CoreProgressManager.a(CoreProgressManager.java:568)
at com.intellij.openapi.progress.impl.CoreProgressManager.executeProcessUnderProgress(CoreProgressManager.java:519)
at com.intellij.openapi.progress.impl.ProgressManagerImpl.executeProcessUnderProgress(ProgressManagerImpl.java:54)
at com.intellij.openapi.progress.impl.CoreProgressManager.runProcess(CoreProgressManager.java:164)
at com.intellij.openapi.progress.impl.ProgressManagerImpl$1.run(ProgressManagerImpl.java:128)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
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)

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