diff --git a/helpers/mailchimp.helper.js b/helpers/mailchimp.helper.js
index 99a1a6b..bc04ec6 100644
--- a/helpers/mailchimp.helper.js
+++ b/helpers/mailchimp.helper.js
@@ -79,12 +79,12 @@ function addMember(listId, member) {
             FNAME: member.name,
             LNAME: member.surname,
             SOURCE: member.source,
-            RESERCODE: member.reservation_code,
+            RESERCODE: (member.reservation_code) ? member.reservation_code : '',
             TICKETCODE: member.code_ticket,
             VALIDATED: (member.validated)? 1 : 0,
-            COLOR: member.color,
+            COLOR: (member.color) ? member.color : '',
             DESCOLOR: member.description,
-            ENTITYNAME: member.entity,
+            ENTITYNAME: (member.entity) ? member.entity : '',
             USERID: member.userId
         }