diff --git a/app.py b/app.py
index 6b463d2..7b023bd 100644
--- a/app.py
+++ b/app.py
@@ -1336,6 +1336,21 @@ def main_page():
             .order_by(ShoppingList.created_at.desc())
             .all()
         )
+
+    # Definiujemy widoczny zakres list dla tego użytkownika
+    if current_user.is_authenticated:
+        visible_lists_query = ShoppingList.query.filter(
+            or_(
+                ShoppingList.owner_id == current_user.id,
+                ShoppingList.is_public == True
+            )
+        )
+    else:
+        visible_lists_query = ShoppingList.query.filter(
+            ShoppingList.is_public == True
+        )
+
+    # Teraz możemy bezpiecznie pobrać miesiące
     month_options = get_active_months_query(visible_lists_query)
 
     all_lists = user_lists + public_lists + archived_lists