From 70635d0870e2a0aada0ba6c644f2687f7c33f68c Mon Sep 17 00:00:00 2001
From: "Dylan K. Taylor" <odigiman@gmail.com>
Date: Sun, 5 Aug 2018 11:32:50 +0100
Subject: [PATCH] DropItemAction: Consider invalid if the target item is null
 it's not possible to drop a null item.

---
 src/pocketmine/inventory/transaction/action/DropItemAction.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/pocketmine/inventory/transaction/action/DropItemAction.php b/src/pocketmine/inventory/transaction/action/DropItemAction.php
index 98e0be68b..6605b5a39 100644
--- a/src/pocketmine/inventory/transaction/action/DropItemAction.php
+++ b/src/pocketmine/inventory/transaction/action/DropItemAction.php
@@ -38,7 +38,7 @@ class DropItemAction extends InventoryAction{
 	}
 
 	public function isValid(Player $source) : bool{
-		return true;
+		return !$this->targetItem->isNull();
 	}
 
 	public function onPreExecute(Player $source) : bool{