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java.util.ConcurrentModificationException
	at java.util.AbstractList$Itr.checkForComodification(AbstractList.java:449)
	at java.util.AbstractList$Itr.next(AbstractList.java:420)
	at org.jetbrains.plugins.ruby.ruby.codeInsight.symbols.structure.SymbolScopeUtil$1.process(SymbolScopeUtil.java:73)
	at org.jetbrains.plugins.ruby.ruby.codeInsight.symbols.structure.SymbolScopeUtil.processSymbolScope(SymbolScopeUtil.java:36)
	at org.jetbrains.plugins.ruby.ruby.codeInsight.symbols.structure.SymbolScopeUtil.processSymbolScope(SymbolScopeUtil.java:55)
	at org.jetbrains.plugins.ruby.ruby.codeInsight.symbols.structure.SymbolScopeUtil.processSymbolScope(SymbolScopeUtil.java:22)
	at org.jetbrains.plugins.ruby.ruby.codeInsight.symbols.structure.SymbolScopeUtil.collectChildrenWithSuperclassesAndIncludes(SymbolScopeUtil.java:69)
	at org.jetbrains.plugins.ruby.ruby.codeInsight.symbols.RubyOverrideImplementUtil.getOverrideScope(RubyOverrideImplementUtil.java:98)
	at org.jetbrains.plugins.ruby.jruby.search.JRubySuperMethodSearchExecutor.execute(JRubySuperMethodSearchExecutor.java:29)
	at org.jetbrains.plugins.ruby.jruby.search.JRubySuperMethodSearchExecutor.execute(JRubySuperMethodSearchExecutor.java:21)
	at com.intellij.util.ExecutorsQuery.processResults(ExecutorsQuery.java:35)
	at com.intellij.util.AbstractExecutorsQuery.forEach(AbstractExecutorsQuery.java:66)
	at com.intellij.util.AbstractExecutorsQuery.findFirst(AbstractExecutorsQuery.java:46)
	at com.intellij.util.UniqueResultsQuery.findFirst(UniqueResultsQuery.java:46)
	at org.jetbrains.plugins.ruby.ruby.codeInsight.lineMarkers.RubyLineMarkerProvider.getMethodMarker(RubyLineMarkerProvider.java:139)
	at org.jetbrains.plugins.ruby.ruby.codeInsight.lineMarkers.RubyLineMarkerProvider.getLineMarkerInfo(RubyLineMarkerProvider.java:102)
	at com.intellij.codeInsight.daemon.impl.LineMarkersPass.addLineMarkers(LineMarkersPass.java:81)
	at com.intellij.codeInsight.daemon.impl.LineMarkersPass.collectInformationWithProgress(LineMarkersPass.java:67)
	at com.intellij.codeInsight.daemon.impl.ProgressableTextEditorHighlightingPass.doCollectInformation(ProgressableTextEditorHighlightingPass.java:36)
	at com.intellij.codeHighlighting.TextEditorHighlightingPass.collectInformation(TextEditorHighlightingPass.java:50)
	at com.intellij.codeInsight.daemon.impl.PassExecutorService$ScheduledPass$1$1.run(PassExecutorService.java:275)
	at com.intellij.openapi.application.impl.ApplicationImpl.runReadAction(ApplicationImpl.java:671)
	at com.intellij.codeInsight.daemon.impl.PassExecutorService$ScheduledPass$1.run(PassExecutorService.java:271)
	at com.intellij.openapi.progress.impl.ProgressManagerImpl.executeProcessUnderProgress(ProgressManagerImpl.java:154)
	at com.intellij.codeInsight.daemon.impl.PassExecutorService$ScheduledPass.run(PassExecutorService.java:268)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:417)
	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:269)
	at java.util.concurrent.FutureTask.run(FutureTask.java:123)
	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:650)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:675)
	at java.lang.Thread.run(Thread.java:613)