diff --git a/helper/exercises.py b/helper/exercises.py
index 8c12869..85d187c 100644
--- a/helper/exercises.py
+++ b/helper/exercises.py
@@ -1085,11 +1085,12 @@ def replace_exercise_if_exists(all_exams, current_exercise, current_exam, seen_k
 
     for exam in all_exams:
         exam_dict = exam.to_dict()
+        exercise_dict = exam_dict.get("parts", [])[0]
         if any(
                 exercise["prompt"] == current_exercise["prompt"] and
                 any(exercise["options"][0]["text"] == current_option["text"] for current_option in
                     current_exercise["options"])
-                for exercise in exam_dict.get("exercises", [])[0]["questions"]
+                for exercise in exercise_dict.get("exercises", [])[0]["questions"]
         ):
             return replace_exercise_if_exists(all_exams, generate_single_mc_level_question(), current_exam, seen_keys)
     return current_exercise, seen_keys