diff --git a/app/routers/event_exhibit_tracking.py b/app/routers/event_exhibit_tracking.py
index 10cf5bf..e040c6d 100644
--- a/app/routers/event_exhibit_tracking.py
+++ b/app/routers/event_exhibit_tracking.py
@@ -282,17 +282,17 @@ async def get_event_exhibit_obj_tracking_list(
 
                 if 'event_badge_address_line_1' in data_dict:
                     data_dict['person_address_line_1'] = data_dict.pop('event_badge_address_line_1')
-                else: data_dict['person_address_line_1'] = null
+                else: data_dict['person_address_line_1'] = None
                 if 'event_badge_address_line_2' in data_dict:
                     data_dict['person_address_line_2'] = data_dict.pop('event_badge_address_line_2')
-                else: data_dict['person_address_line_2'] = null
+                else: data_dict['person_address_line_2'] = None
                 if 'event_badge_address_line_3' in data_dict:
                     data_dict['person_address_line_3'] = data_dict.pop('event_badge_address_line_3')
-                else: data_dict['person_address_line_3'] = null
+                else: data_dict['person_address_line_3'] = None
                 
                 if 'event_badge_city' in data_dict:
                     data_dict['person_city'] = data_dict.pop('event_badge_city')
-                else: data_dict['person_city'] = null
+                else: data_dict['person_city'] = None
 
                 if 'event_badge_country_subdivision_code' in data_dict:
                     data_dict['person_country_subdivision_code'] = data_dict.pop('event_badge_country_subdivision_code')