diff --git a/store/models.py b/store/models.py
index 5d392f7..231956b 100644
--- a/store/models.py
+++ b/store/models.py
@@ -637,16 +637,17 @@ class Checklist(models.Model):
                 self.generate_preview()
 
             # Update available gifts count
-            if self.gift != old_obj.gift:
+            old_gift = getattr(old_obj, 'gift', None)
+            if self.gift != old_gift:
                 # Decrement new gift
                 if self.gift:
                     self.gift.available_count = max(0, self.gift.available_count - 1)
                     self.gift.save()
 
                 # Increment new gift
-                if old_obj.gift:
-                    old_obj.gift.available_count = max(0, old_obj.gift.available_count + 1)
-                    old_obj.gift.save()
+                if old_gift:
+                    old_gift.available_count = max(0, old_gift.available_count + 1)
+                    old_gift.save()
 
         # Save price details to snapshot
         if self.price_snapshot_id: