From a8d1bae4ac0ec1008b0b15562d346aabd9382331 Mon Sep 17 00:00:00 2001
From: Robert Paciorek <robert@opcode.eu.org>
Date: Mon, 2 Oct 2023 19:44:49 +0000
Subject: [PATCH] fix fuse error in "Battle Skills" tutorial

---
 src/Controllers/Common/ContentController.cs | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/Controllers/Common/ContentController.cs b/src/Controllers/Common/ContentController.cs
index 4f497dc..df3a44a 100644
--- a/src/Controllers/Common/ContentController.cs
+++ b/src/Controllers/Common/ContentController.cs
@@ -1074,6 +1074,9 @@ public class ContentController : Controller {
             invItem.Quantity -= item.Quantity;
         }
         foreach (var item in req.BluePrintFuseItemMaps) {
+            if (item.UserInventoryID < 0) {
+                continue; // TODO: what we should do in this case?
+            }
             InventoryItem? invItem = viking.Inventory.InventoryItems.FirstOrDefault(e => e.Id == item.UserInventoryID);
             if (invItem is null)
                 return Ok(new FuseItemsResponse { Status = Status.ItemNotFound });