diff --git a/src/Controllers/Common/ContentController.cs b/src/Controllers/Common/ContentController.cs
index 1e20d12..cf5c102 100644
--- a/src/Controllers/Common/ContentController.cs
+++ b/src/Controllers/Common/ContentController.cs
@@ -1874,6 +1874,8 @@ public class ContentController : Controller {
 
             itemService.CheckAndOpenBox((int)(output.ItemID), gender, out int newItemId, out int quantity);
             for (int i=0; i<quantity; ++i) {
+                if (output.Tier is null)
+                    throw new Exception($"Blueprint {blueprintItem.ItemID} hasn't output tier. Fix item definition: <bp> -> <OUT> -> <T>");
                 resItemList.Add(
                     inventoryService.AddBattleItemToInventory(viking, newItemId, (int)output.Tier)
                 );
diff --git a/src/Resources/items.xml b/src/Resources/items.xml
index 49431f8..173ad91 100644
--- a/src/Resources/items.xml
+++ b/src/Resources/items.xml
@@ -105024,8 +105024,8 @@ Cool down .5 seconds</d>
         <BPSID>27</BPSID>
         <IID>15197</IID>
         <CID xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:nil="true"/>
-        <IR xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:nil="true"/>
-        <T xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:nil="true"/>
+        <IR>4</IR>
+        <T>3</T>
         <QTY>1</QTY>
       </OUT>
     </bp>