diff --git a/ecs/jskult-webapp/src/model/internal/master_mainte_csv.py b/ecs/jskult-webapp/src/model/internal/master_mainte_csv.py
index fe4e328d..a547ee18 100644
--- a/ecs/jskult-webapp/src/model/internal/master_mainte_csv.py
+++ b/ecs/jskult-webapp/src/model/internal/master_mainte_csv.py
@@ -100,9 +100,13 @@ class MasterMainteCSVItem(metaclass=ABCMeta):
         return True if self.mst_inst_repository.fetch_count(self.inst_cd) > 0 else False
     
     def is_exist_emp_chg_type_cd(self, start_date: str) -> bool:
+        if start_date is None or len(start_date) == 0:
+            return False
         return True if self.generic_kbn_mst_repository.fetch_count('emp_chg_type_cd', self.emp_chg_type_cd, start_date) > 0 else False
 
     def is_exist_ta_cd(self, start_date: str) -> bool:
+        if start_date is None or len(start_date) == 0:
+            return False
         return True if self.generic_kbn_mst_repository.fetch_count('ta_cd', self.ta_cd, start_date) > 0 else False
 
     def is_exist_bu_cd(self) -> bool: