From 4a439c3863de04e1c3c051ed2e2fc18f4731d1a9 Mon Sep 17 00:00:00 2001
From: Sandro La Bruzzo <sandro.labruzzo@isti.cnr.it>
Date: Fri, 23 Jul 2021 13:23:25 +0200
Subject: [PATCH] NPE fixed

---
 .../java/eu/dnetlib/dhp/sx/graph/SparkResolveRelation.scala     | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/dhp-workflows/dhp-graph-mapper/src/main/java/eu/dnetlib/dhp/sx/graph/SparkResolveRelation.scala b/dhp-workflows/dhp-graph-mapper/src/main/java/eu/dnetlib/dhp/sx/graph/SparkResolveRelation.scala
index 11d026f02..9e7963b2a 100644
--- a/dhp-workflows/dhp-graph-mapper/src/main/java/eu/dnetlib/dhp/sx/graph/SparkResolveRelation.scala
+++ b/dhp-workflows/dhp-graph-mapper/src/main/java/eu/dnetlib/dhp/sx/graph/SparkResolveRelation.scala
@@ -48,7 +48,7 @@ object SparkResolveRelation {
       m =>
         val sourceResolved = m._2
         val currentRelation = m._1._2
-        if (sourceResolved!=null && sourceResolved._2.nonEmpty)
+        if (sourceResolved!=null && sourceResolved._2!=null && sourceResolved._2.nonEmpty)
           currentRelation.setSource(sourceResolved._2)
         currentRelation
     }.write