diff --git a/dhp-workflows/dhp-aggregation/src/main/scala/eu/dnetlib/dhp/bioschema/BioschemaToOAFTransformation.scala b/dhp-workflows/dhp-aggregation/src/main/scala/eu/dnetlib/dhp/bioschema/BioschemaToOAFTransformation.scala
index a8aad8e07..d86486f3b 100644
--- a/dhp-workflows/dhp-aggregation/src/main/scala/eu/dnetlib/dhp/bioschema/BioschemaToOAFTransformation.scala
+++ b/dhp-workflows/dhp-aggregation/src/main/scala/eu/dnetlib/dhp/bioschema/BioschemaToOAFTransformation.scala
@@ -100,7 +100,9 @@ object BioschemaToOAFTransformation {
     result.setDataInfo(dataInfo)
 
     val titles: List[TitleType] = (json \\ "titles").extractOrElse[List[TitleType]](List())
-
+    if (titles.isEmpty) {
+      return List()
+    }
     result.setTitle(
       titles
         .filter(t => t.title.nonEmpty)
@@ -189,6 +191,9 @@ object BioschemaToOAFTransformation {
         })
         .asJava
     )
+    if (instance.getUrl.isEmpty) {
+      return List()
+    }
     instance.setCollectedfrom(collectedFromMap(datasourceKey))
     instance.setPid(result.getPid)