diff --git a/dhp-common/src/main/java/eu/dnetlib/dhp/schema/oaf/utils/IdentifierFactory.java b/dhp-common/src/main/java/eu/dnetlib/dhp/schema/oaf/utils/IdentifierFactory.java
index 8b297079c..0641afb83 100644
--- a/dhp-common/src/main/java/eu/dnetlib/dhp/schema/oaf/utils/IdentifierFactory.java
+++ b/dhp-common/src/main/java/eu/dnetlib/dhp/schema/oaf/utils/IdentifierFactory.java
@@ -10,12 +10,12 @@ import java.util.function.Function;
 import java.util.stream.Collectors;
 import java.util.stream.Stream;
 
-import eu.dnetlib.dhp.schema.common.ModelSupport;
 import org.apache.commons.lang3.StringUtils;
 
 import com.google.common.collect.HashBiMap;
 import com.google.common.collect.Maps;
 
+import eu.dnetlib.dhp.schema.common.ModelSupport;
 import eu.dnetlib.dhp.schema.oaf.*;
 import eu.dnetlib.dhp.utils.DHPUtils;
 
@@ -60,29 +60,33 @@ public class IdentifierFactory implements Serializable {
 		return pidFromInstance(pid, collectedFrom).distinct().collect(Collectors.toList());
 	}
 
-	public static <T extends  Result> String createDOIBoostIdentifier(T entity) {
+	public static <T extends Result> String createDOIBoostIdentifier(T entity) {
 		if (entity == null)
-			return  null;
+			return null;
 
 		StructuredProperty pid = null;
-		if(entity.getPid() != null ) {
-			pid = entity.getPid()
-					.stream()
-					.filter(Objects::nonNull)
-					.filter(s -> s.getQualifier()!= null && "doi".equalsIgnoreCase(s.getQualifier().getClassid()))
-					.filter(IdentifierFactory::pidFilter)
-			.findAny().orElse(null);
+		if (entity.getPid() != null) {
+			pid = entity
+				.getPid()
+				.stream()
+				.filter(Objects::nonNull)
+				.filter(s -> s.getQualifier() != null && "doi".equalsIgnoreCase(s.getQualifier().getClassid()))
+				.filter(IdentifierFactory::pidFilter)
+				.findAny()
+				.orElse(null);
 		} else {
-			if (entity.getInstance()!= null) {
-				pid = entity.getInstance()
-						.stream()
-						.filter(i -> i.getPid()!= null)
-						.flatMap(i -> i.getPid().stream())
-						.filter(IdentifierFactory::pidFilter)
-						.findAny().orElse(null);
+			if (entity.getInstance() != null) {
+				pid = entity
+					.getInstance()
+					.stream()
+					.filter(i -> i.getPid() != null)
+					.flatMap(i -> i.getPid().stream())
+					.filter(IdentifierFactory::pidFilter)
+					.findAny()
+					.orElse(null);
 			}
 		}
-		if (pid!= null)
+		if (pid != null)
 			return idFromPid(entity, pid, true);
 		return null;
 	}
diff --git a/dhp-workflows/dhp-doiboost/src/main/java/eu/dnetlib/doiboost/DoiBoostMappingUtil.scala b/dhp-workflows/dhp-doiboost/src/main/java/eu/dnetlib/doiboost/DoiBoostMappingUtil.scala
index efe8453a2..32c58595f 100644
--- a/dhp-workflows/dhp-doiboost/src/main/java/eu/dnetlib/doiboost/DoiBoostMappingUtil.scala
+++ b/dhp-workflows/dhp-doiboost/src/main/java/eu/dnetlib/doiboost/DoiBoostMappingUtil.scala
@@ -196,6 +196,8 @@ object DoiBoostMappingUtil {
     //Case empty publication
     if (publication == null)
       return false
+    if (publication.getId == null || publication.getId.isEmpty)
+      return false
 
     //Case publication with no title
     if (publication.getTitle == null || publication.getTitle.size == 0)