diff --git a/app/dao/jobs_dao.py b/app/dao/jobs_dao.py
index 2074d6ab6..41ba00940 100644
--- a/app/dao/jobs_dao.py
+++ b/app/dao/jobs_dao.py
@@ -27,11 +27,11 @@ def dao_get_job_by_service_id_and_job_id(service_id, job_id):
     return Job.query.filter_by(service_id=service_id, id=job_id).one()
 
 
-def dao_get_jobs_by_service_id(service_id, limit_days=None, page=1, page_size=50, statuses=''):
+def dao_get_jobs_by_service_id(service_id, limit_days=None, page=1, page_size=50, statuses=None):
     query_filter = [Job.service_id == service_id]
     if limit_days is not None:
         query_filter.append(cast(Job.created_at, sql_date) >= days_ago(limit_days))
-    if statuses != ['']:
+    if statuses is not None and statuses != ['']:
         query_filter.append(
             Job.job_status.in_(statuses)
         )
diff --git a/app/models.py b/app/models.py
index 0a6457667..d1f0eda5f 100644
--- a/app/models.py
+++ b/app/models.py
@@ -313,6 +313,7 @@ JOB_STATUS_TYPES = [
     JOB_STATUS_CANCELLED
 ]
 
+
 class JobStatus(db.Model):
     __tablename__ = 'job_status'