diff --git a/dags/fetch_notices_by_query.py b/dags/fetch_notices_by_query.py
index 8cf2c19f..dd8c950e 100644
--- a/dags/fetch_notices_by_query.py
+++ b/dags/fetch_notices_by_query.py
@@ -26,7 +26,7 @@
      tags=['fetch'],
      params={
          QUERY_DAG_KEY: Param(
-             default=None,
+             default="",
              type="string",
              title="Query",
              description="""This field is required.