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

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java.lang.NullPointerException:
at com.kgmyshin.ideaplugin.eventbus.SenderFilter.shouldShow(SenderFilter.java:43)
at com.kgmyshin.ideaplugin.eventbus.ShowUsagesAction$10.process(ShowUsagesAction.java:381)
at com.kgmyshin.ideaplugin.eventbus.ShowUsagesAction$10.process(ShowUsagesAction.java:376)
at com.intellij.find.findUsages.FindUsagesManager$2$2.process(FindUsagesManager.java:358)
at com.intellij.find.findUsages.FindUsagesManager$2$2.process(FindUsagesManager.java:349)
at com.intellij.util.CommonProcessors$UniqueProcessor.process(CommonProcessors.java:120)
at com.intellij.find.findUsages.FindUsagesManager$2$4.process(FindUsagesManager.java:404)
at com.intellij.find.findUsages.FindUsagesManager$2$4.process(FindUsagesManager.java:394)
at com.intellij.psi.impl.search.MethodTextOccurrenceProcessor.processReference(MethodTextOccurrenceProcessor.java:64)
at com.intellij.psi.impl.search.MethodTextOccurrenceProcessor.processTextOccurrence(MethodTextOccurrenceProcessor.java:47)
at com.intellij.psi.impl.search.PsiSearchHelperImpl$17.execute(PsiSearchHelperImpl.java:765)
at com.intellij.psi.impl.search.LowLevelSearchUtil.processTreeUp(LowLevelSearchUtil.java:126)
at com.intellij.psi.impl.search.LowLevelSearchUtil.processElementsContainingWordInElement(LowLevelSearchUtil.java:200)
at com.intellij.psi.impl.search.PsiSearchHelperImpl$3$1.compute(PsiSearchHelperImpl.java:214)
at com.intellij.psi.impl.search.PsiSearchHelperImpl$3$1.compute(PsiSearchHelperImpl.java:211)
at com.intellij.openapi.application.impl.ApplicationImpl.runReadAction(ApplicationImpl.java:890)
at com.intellij.psi.impl.search.PsiSearchHelperImpl$3.process(PsiSearchHelperImpl.java:211)
at com.intellij.psi.impl.search.PsiSearchHelperImpl$3.process(PsiSearchHelperImpl.java:208)
at com.intellij.psi.impl.search.PsiSearchHelperImpl$16.process(PsiSearchHelperImpl.java:729)
at com.intellij.psi.impl.search.PsiSearchHelperImpl$16.process(PsiSearchHelperImpl.java:723)
at com.intellij.psi.impl.search.PsiSearchHelperImpl$7.compute(PsiSearchHelperImpl.java:371)
at com.intellij.psi.impl.search.PsiSearchHelperImpl$7.compute(PsiSearchHelperImpl.java:356)
at com.intellij.openapi.application.ex.ApplicationUtil$1.run(ApplicationUtil.java:37)
at com.intellij.openapi.application.impl.ApplicationImpl.tryRunReadAction(ApplicationImpl.java:1104)
at com.intellij.openapi.application.ex.ApplicationUtil.tryRunReadAction(ApplicationUtil.java:34)
at com.intellij.psi.impl.search.PsiSearchHelperImpl.processVirtualFile(PsiSearchHelperImpl.java:356)
at com.intellij.psi.impl.search.PsiSearchHelperImpl.access$000(PsiSearchHelperImpl.java:68)
at com.intellij.psi.impl.search.PsiSearchHelperImpl$4.process(PsiSearchHelperImpl.java:304)
at com.intellij.psi.impl.search.PsiSearchHelperImpl$4.process(PsiSearchHelperImpl.java:299)
at com.intellij.concurrency.ApplierCompleter.execAndForkSubTasks(ApplierCompleter.java:122)
at com.intellij.concurrency.ApplierCompleter.access$000(ApplierCompleter.java:44)
at com.intellij.concurrency.ApplierCompleter$1.run(ApplierCompleter.java:85)
at com.intellij.openapi.progress.impl.CoreProgressManager.registerIndicatorAndRun(CoreProgressManager.java:452)
at com.intellij.openapi.progress.impl.CoreProgressManager.registerIndicatorAndRun(CoreProgressManager.java:449)
at com.intellij.openapi.progress.impl.CoreProgressManager.executeProcessUnderProgress(CoreProgressManager.java:402)
at com.intellij.openapi.progress.impl.ProgressManagerImpl.executeProcessUnderProgress(ProgressManagerImpl.java:54)
at com.intellij.concurrency.ApplierCompleter.wrapInReadActionAndIndicator(ApplierCompleter.java:106)
at jsr166e.CountedCompleter.exec(CountedCompleter.java:684)
at jsr166e.ForkJoinTask.doExec(ForkJoinTask.java:260)
at jsr166e.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:858)
at jsr166e.ForkJoinPool.scan(ForkJoinPool.java:1687)
at jsr166e.ForkJoinPool.runWorker(ForkJoinPool.java:1642)
at jsr166e.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:109)

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