diff --git a/backend/apis/nodejs/src/models/job_offer_model.js b/backend/apis/nodejs/src/models/job_offer_model.js
index 2291dc9..82f094e 100644
--- a/backend/apis/nodejs/src/models/job_offer_model.js
+++ b/backend/apis/nodejs/src/models/job_offer_model.js
@@ -31,7 +31,7 @@ async function insert(requester, organizationId, title, description, requirement
                 .returning('*');
 
             // Insert in the JobOfferTag table all the relevant tags.
-            if (tags.length !== 0) {
+            if (tags) {
                 await Promise.all(tags.map(tag =>
                     tr('JobOfferTag').insert({
                         job_offer_id: jobOffer[0].id,
diff --git a/backend/apis/nodejs/src/models/tags_model.js b/backend/apis/nodejs/src/models/tags_model.js
index 92d0f2b..3958565 100644
--- a/backend/apis/nodejs/src/models/tags_model.js
+++ b/backend/apis/nodejs/src/models/tags_model.js
@@ -14,6 +14,9 @@
 const knex = require('../utils/knex_config');
 
 async function findByTags(tags) {
+    if(!tags){
+        return null;
+    }
     tags = tags.map(tag => tag.toLowerCase());
     const result = await knex('Tag')
         .whereIn('tag', tags)