diff --git a/dhp-workflows/dhp-enrichment/src/main/java/eu/dnetlib/dhp/bulktag/community/Constraints.java b/dhp-workflows/dhp-enrichment/src/main/java/eu/dnetlib/dhp/bulktag/community/Constraints.java
index 0f6fab238..75a88c7f3 100644
--- a/dhp-workflows/dhp-enrichment/src/main/java/eu/dnetlib/dhp/bulktag/community/Constraints.java
+++ b/dhp-workflows/dhp-enrichment/src/main/java/eu/dnetlib/dhp/bulktag/community/Constraints.java
@@ -53,6 +53,8 @@ public class Constraints implements Serializable {
 
 		for (Constraint sc : constraint) {
 			boolean verified = false;
+			if(!param.containsKey(sc.getField()))
+				return false;
 			for (String value : param.get(sc.getField())) {
 				if (sc.verifyCriteria(value.trim())) {
 					verified = true;