Update app.py

app.py

@@ -117,7 +117,7 @@ def start_test(student_id, state):
     if not student_id or student_id.strip() == "":
         return (
             state,
-            "", "", 0, "", "",
+            "", "", 0, "", None,
             "⚠️ 学生番号を入力してからテストを開始してください",
             False, "", "", ""
         )
@@ -133,7 +133,7 @@ def start_test(student_id, state):
 
     return (
         state,
-        text, question, level, passage_id, "",
+        text, question, level, passage_id, None,
         "", True, displayed_time.isoformat(), 1, state["user_id"]
     )