diff --git a/helper/exercises.py b/helper/exercises.py
index c516e6a..81fa7a5 100644
--- a/helper/exercises.py
+++ b/helper/exercises.py
@@ -1259,15 +1259,16 @@ 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 len(exercise_dict.get("exercises", [])) > 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 exercise_dict.get("exercises", [])[0]["questions"]
-            ):
-                return replace_exercise_if_exists(all_exams, generate_single_mc_level_question(), current_exam, seen_keys)
+        if len(exam_dict.get("parts", [])) > 0:
+            exercise_dict = exam_dict.get("parts", [])[0]
+            if len(exercise_dict.get("exercises", [])) > 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 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