Update app.py

app.py

@@ -150,7 +150,7 @@ def next_step(prev_level, user_answer, question_text, passage_text, start_time,
     global question_count, used_texts
 
     if user_answer is None or user_answer == "":
-    return "⚠️ Please select an answer!", passage_text, question_text, prev_level, None, "", True, start_time, user_id
+        return "⚠️ Please select an answer!", passage_text, question_text, prev_level, None, "", True, start_time, user_id
 
     question_count += 1