From c08b7ae5be83fc3adaea2e1dc3ebea3ec16ce099 Mon Sep 17 00:00:00 2001
From: NichtStudioCode <51272202+NichtStudioCode@users.noreply.github.com>
Date: Mon, 2 Aug 2021 12:24:52 +0200
Subject: [PATCH] Fixed NullPointerException in VirtualInventory#putItemStack

When an ItemUpdateEvent set the newItemStack to null, a NullPointerException was thrown.
This has been fixed.
---
 .../de/studiocode/invui/virtualinventory/VirtualInventory.java | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/InvUI/src/main/java/de/studiocode/invui/virtualinventory/VirtualInventory.java b/InvUI/src/main/java/de/studiocode/invui/virtualinventory/VirtualInventory.java
index 134f8b9..1627bf2 100644
--- a/InvUI/src/main/java/de/studiocode/invui/virtualinventory/VirtualInventory.java
+++ b/InvUI/src/main/java/de/studiocode/invui/virtualinventory/VirtualInventory.java
@@ -411,7 +411,8 @@ public class VirtualInventory implements ConfigurationSerializable {
                     items[slot] = newItemStack;
                     notifyWindows();
                     
-                    return itemStack.getAmount() - (newItemStack.getAmount() - currentAmount);
+                    int newAmount = newItemStack != null ? newItemStack.getAmount() : 0;
+                    return itemStack.getAmount() - (newAmount - currentAmount);
                 }
             }
         }