diff --git a/ecs/jskult-batch-daily/tests/testing_vjsk_utility.py b/ecs/jskult-batch-daily/tests/testing_vjsk_utility.py
index 441c5c9e..06173c2e 100644
--- a/ecs/jskult-batch-daily/tests/testing_vjsk_utility.py
+++ b/ecs/jskult-batch-daily/tests/testing_vjsk_utility.py
@@ -113,6 +113,9 @@ def assert_table_results(actual_rows: list[dict], expect_rows: list[dict], ignor
                 elif actual_value == "0000-00-00 00:00:00" and expect_value == "":
                     # DB項目(datetime)がゼロ日付(NULL代替値)の場合、期待値が""であれば"0000-00-00 00:00:00"に置換する
                     expect_value = "0000-00-00 00:00:00"
+                elif actual_value == "" and expect_value == "":
+                    # DB項目値が空文字のかつ期待値が""のパターンは想定外のパターンであるため、期待値をNoneに置換して失敗させる
+                    expect_value = None
 
                 # 検証
                 assert actual_value == expect_value, f'{line_number}行目:"{actual_col_name}" : "{actual_value}" ({type(actual_value)})が、期待値 "{expect_value}" ({type(expect_value)}) と一致しませんでした'