diff --git a/lib/services/ngsi/entities-NGSI-v2.js b/lib/services/ngsi/entities-NGSI-v2.js
index fb668f3c0..d593b50a6 100644
--- a/lib/services/ngsi/entities-NGSI-v2.js
+++ b/lib/services/ngsi/entities-NGSI-v2.js
@@ -343,7 +343,8 @@ function sendUpdateValueNgsi2(entityName, attributes, typeInformation, token, ca
     const payload = {
         entities: [
             {
-                id: entityName
+                // CB entity id should be always a String
+                id: String(entityName)
             }
         ]
     };
@@ -677,8 +678,9 @@ function sendUpdateValueNgsi2(entityName, attributes, typeInformation, token, ca
             logger.debug(context, 'sendUpdateValueNgsi2 entityNameExp %j ', typeInformation.entityNameExp);
             entityName = expressionPlugin.applyExpression(typeInformation.entityNameExp, ctxt, typeInformation);
             // CB entity id should be always a String
-            payload.entities[0].id = String(entityName);
-            ctxt['entity_name'] = String(entityName);
+            entityName = String(entityName);
+            payload.entities[0].id = entityName;
+            ctxt['entity_name'] = entityName;
         } catch (e) {
             logger.debug(
                 context,
diff --git a/package.json b/package.json
index 5ba1efa20..821ede4b0 100644
--- a/package.json
+++ b/package.json
@@ -2,7 +2,7 @@
   "name": "iotagent-node-lib",
   "license": "AGPL-3.0-only",
   "description": "IoT Agent library to interface with NGSI Context Broker",
-  "version": "3.4.1",
+  "version": "3.4.2",
   "homepage": "https://github.com/telefonicaid/iotagent-node-lib",
   "keywords": [
     "fiware",