From e2817c696ac25bebdd1fbbbaed6b0d0824f286e6 Mon Sep 17 00:00:00 2001
From: AnimeGitB <AnimeGitB@bigblueball.in>
Date: Thu, 12 May 2022 02:36:34 +0930
Subject: [PATCH] Fix immutable lists

---
 .../java/emu/grasscutter/game/managers/InventoryManager.java    | 2 +-
 .../emu/grasscutter/server/packet/recv/HandlerBuyGoodsReq.java  | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/main/java/emu/grasscutter/game/managers/InventoryManager.java b/src/main/java/emu/grasscutter/game/managers/InventoryManager.java
index 7c0288318..6efe945aa 100644
--- a/src/main/java/emu/grasscutter/game/managers/InventoryManager.java
+++ b/src/main/java/emu/grasscutter/game/managers/InventoryManager.java
@@ -696,7 +696,7 @@ public class InventoryManager {
 		}
 		
 		// Pay materials and mora if possible
-		List<ItemParamData> costs = proudSkill.getCostItems();  // Can this be null?
+		List<ItemParamData> costs = new ArrayList<ItemParamData>(proudSkill.getCostItems());  // Can this be null?
 		if (proudSkill.getCoinCost() > 0) {
 			costs.add(new ItemParamData(202, proudSkill.getCoinCost()));
 		}
diff --git a/src/main/java/emu/grasscutter/server/packet/recv/HandlerBuyGoodsReq.java b/src/main/java/emu/grasscutter/server/packet/recv/HandlerBuyGoodsReq.java
index fc9564734..25cf05d24 100644
--- a/src/main/java/emu/grasscutter/server/packet/recv/HandlerBuyGoodsReq.java
+++ b/src/main/java/emu/grasscutter/server/packet/recv/HandlerBuyGoodsReq.java
@@ -56,7 +56,7 @@ public class HandlerBuyGoodsReq extends PacketHandler {
                 return;
             }
 
-            List<ItemParamData> costs = sg.getCostItemList();  // Can this even be null?
+            List<ItemParamData> costs = new ArrayList<ItemParamData>(sg.getCostItemList());  // Can this even be null?
             costs.add(new ItemParamData(202, sg.getScoin()));
             costs.add(new ItemParamData(201, sg.getHcoin()));
             costs.add(new ItemParamData(203, sg.getMcoin()));