diff --git a/QuestValidator/Program.cs b/QuestValidator/Program.cs
index 9b4b13c..82286e2 100644
--- a/QuestValidator/Program.cs
+++ b/QuestValidator/Program.cs
@@ -119,9 +119,9 @@ namespace QuestValidator
                 CheckValuesMatch(questSuccessRewardItem.value, relatedLiveRewardItem.value, "mismatch for success item reward value", questSuccessRewardItem.id);
 
                 // Check item stack count
-                if (questSuccessRewardItem.items[0] != null && questSuccessRewardItem.items[0].upd != null)
+                if (questSuccessRewardItem.items[0]?.upd != null && relatedLiveRewardItem.items[0]?.upd != null)
                 {
-                    CheckValuesMatch(questSuccessRewardItem.items[0].upd.StackObjectsCount, questSuccessRewardItem.items[0].upd.StackObjectsCount, "mismatch for success item StackObjectsCount", questSuccessRewardItem.items[0]._id);
+                    CheckValuesMatch(questSuccessRewardItem.items[0].upd.StackObjectsCount, relatedLiveRewardItem.items[0].upd.StackObjectsCount, "mismatch for success item StackObjectsCount", questSuccessRewardItem.items[0]._id);
                 }
 
                 // check sub items match