From 837d95f6d2518822bae82a45d6d38db1b87d2f2b Mon Sep 17 00:00:00 2001
From: Dmitry Batkovich <dmitry.batkovich@jetbrains.com>
Date: Thu, 27 Oct 2016 10:23:28 +0300
Subject: [PATCH] wrap with read action

---
 .../compiler/backwardRefs/CompilerReferenceServiceImpl.java    | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/java/compiler/impl/src/com/intellij/compiler/backwardRefs/CompilerReferenceServiceImpl.java b/java/compiler/impl/src/com/intellij/compiler/backwardRefs/CompilerReferenceServiceImpl.java
index 34719a9bbf32..d900e9241878 100644
--- a/java/compiler/impl/src/com/intellij/compiler/backwardRefs/CompilerReferenceServiceImpl.java
+++ b/java/compiler/impl/src/com/intellij/compiler/backwardRefs/CompilerReferenceServiceImpl.java
@@ -211,7 +211,8 @@ public class CompilerReferenceServiceImpl extends CompilerReferenceService imple
   }
 
   private boolean isServiceEnabledFor(PsiElement element) {
-    return isServiceEnabled() && !InjectedLanguageManager.getInstance(myProject).isInjectedFragment(element.getContainingFile());
+    return isServiceEnabled() &&
+           !InjectedLanguageManager.getInstance(myProject).isInjectedFragment(ReadAction.compute(() -> element.getContainingFile()));
   }
 
   private boolean isServiceEnabled() {