diff --git a/platform/lang-impl/src/com/intellij/codeInsight/daemon/impl/DaemonCodeAnalyzerImpl.java b/platform/lang-impl/src/com/intellij/codeInsight/daemon/impl/DaemonCodeAnalyzerImpl.java
index 3fe19a682c40..a4eaa3488a78 100644
--- a/platform/lang-impl/src/com/intellij/codeInsight/daemon/impl/DaemonCodeAnalyzerImpl.java
+++ b/platform/lang-impl/src/com/intellij/codeInsight/daemon/impl/DaemonCodeAnalyzerImpl.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2000-2015 JetBrains s.r.o.
+ * Copyright 2000-2016 JetBrains s.r.o.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -925,6 +925,8 @@ public class DaemonCodeAnalyzerImpl extends DaemonCodeAnalyzerEx implements Pers
 
   @NotNull
   private Collection<FileEditor> getSelectedEditors() {
+    ApplicationManager.getApplication().assertIsDispatchThread();
+
     // Editors in modal context
     List<Editor> editors = getActiveEditors();