diff --git a/src/redturtle/prenotazioni/restapi/services/booking/add.py b/src/redturtle/prenotazioni/restapi/services/booking/add.py
index 50cc5848..d80d0c70 100644
--- a/src/redturtle/prenotazioni/restapi/services/booking/add.py
+++ b/src/redturtle/prenotazioni/restapi/services/booking/add.py
@@ -164,7 +164,7 @@ def validate(self):
             raise BadRequest(msg)
 
         # booking.additional_fields validation below
-        additional_fields = data.get("additional_fields")
+        additional_fields = data.get("additional_fields") or []
 
         # rewrite the fields to prevent not required data
         additional_fields_data = []
@@ -185,8 +185,7 @@ def validate(self):
             )
         )[0]
 
-        for field_schema in booking_type.booking_additional_fields_schema:
-
+        for field_schema in booking_type.booking_additional_fields_schema or []:
             field = list(
                 filter(
                     lambda i: i.get("name") == field_schema.get("name"),
diff --git a/src/redturtle/prenotazioni/restapi/services/booking/update.py b/src/redturtle/prenotazioni/restapi/services/booking/update.py
index e93c1647..583877df 100644
--- a/src/redturtle/prenotazioni/restapi/services/booking/update.py
+++ b/src/redturtle/prenotazioni/restapi/services/booking/update.py
@@ -25,7 +25,7 @@ def handle_additional_fields(self):
 
         if data:
             # booking.additional_fields validation below
-            additional_fields = data.get("additional_fields")
+            additional_fields = data.get("additional_fields") or []
 
             # rewrite the fields to prevent not required data
             additional_fields_data = []
@@ -41,7 +41,7 @@ def handle_additional_fields(self):
 
             booking_type = self.context.get_booking_type()
 
-            for field_schema in booking_type.booking_additional_fields_schema:
+            for field_schema in booking_type.booking_additional_fields_schema or []:
                 field = list(
                     filter(
                         lambda i: i.get("name") == field_schema.get("name"),