From 653944e2aa798ac27319630620443c46cc99be17 Mon Sep 17 00:00:00 2001
From: Dmitry Batkovich <dmitry.batkovich@jetbrains.com>
Date: Thu, 15 Dec 2016 16:17:23 +0300
Subject: [PATCH] javac ast indices: prevent npe while recompilation of single
 file

---
 .../jetbrains/jps/backwardRefs/BackwardReferenceRegistrar.java  | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/jps/jps-builders/src/org/jetbrains/jps/backwardRefs/BackwardReferenceRegistrar.java b/jps/jps-builders/src/org/jetbrains/jps/backwardRefs/BackwardReferenceRegistrar.java
index b6fb8ee5177a..83d317582114 100644
--- a/jps/jps-builders/src/org/jetbrains/jps/backwardRefs/BackwardReferenceRegistrar.java
+++ b/jps/jps-builders/src/org/jetbrains/jps/backwardRefs/BackwardReferenceRegistrar.java
@@ -32,7 +32,7 @@ public class BackwardReferenceRegistrar implements JavacFileReferencesRegistrar
 
   @Override
   public boolean isEnabled() {
-    return BackwardReferenceIndexWriter.isEnabled();
+    return BackwardReferenceIndexWriter.isEnabled() && BackwardReferenceIndexWriter.getInstance() != null;
   }
 
   @Override