diff --git a/dhp-workflows/dhp-graph-mapper/src/main/java/eu/dnetlib/dhp/oa/graph/clean/GroupEntitiesAndRelationsSparkJob.java b/dhp-workflows/dhp-graph-mapper/src/main/java/eu/dnetlib/dhp/oa/graph/clean/GroupEntitiesAndRelationsSparkJob.java
index 9c80528e3..e2ff90d7b 100644
--- a/dhp-workflows/dhp-graph-mapper/src/main/java/eu/dnetlib/dhp/oa/graph/clean/GroupEntitiesAndRelationsSparkJob.java
+++ b/dhp-workflows/dhp-graph-mapper/src/main/java/eu/dnetlib/dhp/oa/graph/clean/GroupEntitiesAndRelationsSparkJob.java
@@ -10,6 +10,7 @@ import java.util.Objects;
 import java.util.Optional;
 import java.util.stream.Collectors;
 
+import com.fasterxml.jackson.databind.DeserializationFeature;
 import org.apache.commons.io.IOUtils;
 import org.apache.commons.lang3.StringUtils;
 import org.apache.spark.SparkConf;
@@ -44,7 +45,8 @@ public class GroupEntitiesAndRelationsSparkJob {
 
 	private final static String SOURCE_JPATH = "$.source";
 
-	private static final ObjectMapper OBJECT_MAPPER = new ObjectMapper();
+	private static final ObjectMapper OBJECT_MAPPER = new ObjectMapper()
+			.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
 
 	public static void main(String[] args) throws Exception {