diff --git a/src/inventory/transaction/InventoryTransaction.php b/src/inventory/transaction/InventoryTransaction.php
index e7b4a6d3fc..ea506e388c 100644
--- a/src/inventory/transaction/InventoryTransaction.php
+++ b/src/inventory/transaction/InventoryTransaction.php
@@ -142,8 +142,10 @@ class InventoryTransaction{
 				$needItems[] = $action->getTargetItem();
 			}
 
-			if(!$action->isValid($this->source)){
-				throw new TransactionValidationException("Action " . get_class($action) . " is not valid in the current transaction");
+			try{
+				$action->validate($this->source);
+			}catch(TransactionValidationException $e){
+				throw new TransactionValidationException(get_class($action) . ": " . $e->getMessage(), 0, $e);
 			}
 
 			if(!$action->getSourceItem()->isNull()){
diff --git a/src/inventory/transaction/action/CreateItemAction.php b/src/inventory/transaction/action/CreateItemAction.php
index 18cd4a5368..dbe02798ee 100644
--- a/src/inventory/transaction/action/CreateItemAction.php
+++ b/src/inventory/transaction/action/CreateItemAction.php
@@ -24,6 +24,7 @@ declare(strict_types=1);
 namespace pocketmine\inventory\transaction\action;
 
 use pocketmine\inventory\CreativeInventory;
+use pocketmine\inventory\transaction\TransactionValidationException;
 use pocketmine\item\Item;
 use pocketmine\item\ItemFactory;
 use pocketmine\player\Player;
@@ -38,8 +39,13 @@ class CreateItemAction extends InventoryAction{
 		parent::__construct($sourceItem, ItemFactory::air());
 	}
 
-	public function isValid(Player $source) : bool{
-		return !$source->hasFiniteResources() and CreativeInventory::getInstance()->contains($this->sourceItem);
+	public function validate(Player $source) : void{
+		if($source->hasFiniteResources()){
+			throw new TransactionValidationException("Player has finite resources, cannot create items");
+		}
+		if(!CreativeInventory::getInstance()->contains($this->sourceItem)){
+			throw new TransactionValidationException("Creative inventory does not contain requested item");
+		}
 	}
 
 	public function execute(Player $source) : void{
diff --git a/src/inventory/transaction/action/DestroyItemAction.php b/src/inventory/transaction/action/DestroyItemAction.php
index d59485c072..6edd30af2a 100644
--- a/src/inventory/transaction/action/DestroyItemAction.php
+++ b/src/inventory/transaction/action/DestroyItemAction.php
@@ -23,6 +23,7 @@ declare(strict_types=1);
 
 namespace pocketmine\inventory\transaction\action;
 
+use pocketmine\inventory\transaction\TransactionValidationException;
 use pocketmine\item\Item;
 use pocketmine\item\ItemFactory;
 use pocketmine\player\Player;
@@ -37,8 +38,10 @@ class DestroyItemAction extends InventoryAction{
 		parent::__construct(ItemFactory::air(), $targetItem);
 	}
 
-	public function isValid(Player $source) : bool{
-		return !$source->hasFiniteResources();
+	public function validate(Player $source) : void{
+		if($source->hasFiniteResources()){
+			throw new TransactionValidationException("Player has finite resources, cannot destroy items");
+		}
 	}
 
 	public function execute(Player $source) : void{
diff --git a/src/inventory/transaction/action/DropItemAction.php b/src/inventory/transaction/action/DropItemAction.php
index a15e3fdd05..2e20d5f93d 100644
--- a/src/inventory/transaction/action/DropItemAction.php
+++ b/src/inventory/transaction/action/DropItemAction.php
@@ -24,6 +24,7 @@ declare(strict_types=1);
 namespace pocketmine\inventory\transaction\action;
 
 use pocketmine\event\player\PlayerDropItemEvent;
+use pocketmine\inventory\transaction\TransactionValidationException;
 use pocketmine\item\Item;
 use pocketmine\item\ItemFactory;
 use pocketmine\player\Player;
@@ -37,8 +38,10 @@ class DropItemAction extends InventoryAction{
 		parent::__construct(ItemFactory::air(), $targetItem);
 	}
 
-	public function isValid(Player $source) : bool{
-		return !$this->targetItem->isNull();
+	public function validate(Player $source) : void{
+		if($this->targetItem->isNull()){
+			throw new TransactionValidationException("Cannot drop an empty itemstack");
+		}
 	}
 
 	public function onPreExecute(Player $source) : bool{
diff --git a/src/inventory/transaction/action/InventoryAction.php b/src/inventory/transaction/action/InventoryAction.php
index 5b1e8db5db..4fa3ac15e5 100644
--- a/src/inventory/transaction/action/InventoryAction.php
+++ b/src/inventory/transaction/action/InventoryAction.php
@@ -24,6 +24,7 @@ declare(strict_types=1);
 namespace pocketmine\inventory\transaction\action;
 
 use pocketmine\inventory\transaction\InventoryTransaction;
+use pocketmine\inventory\transaction\TransactionValidationException;
 use pocketmine\item\Item;
 use pocketmine\player\Player;
 
@@ -57,8 +58,10 @@ abstract class InventoryAction{
 
 	/**
 	 * Returns whether this action is currently valid. This should perform any necessary sanity checks.
+	 *
+	 * @throws TransactionValidationException
 	 */
-	abstract public function isValid(Player $source) : bool;
+	abstract public function validate(Player $source) : void;
 
 	/**
 	 * Called when the action is added to the specified InventoryTransaction.
diff --git a/src/inventory/transaction/action/SlotChangeAction.php b/src/inventory/transaction/action/SlotChangeAction.php
index eda92b4579..1686c261bb 100644
--- a/src/inventory/transaction/action/SlotChangeAction.php
+++ b/src/inventory/transaction/action/SlotChangeAction.php
@@ -25,6 +25,7 @@ namespace pocketmine\inventory\transaction\action;
 
 use pocketmine\inventory\Inventory;
 use pocketmine\inventory\transaction\InventoryTransaction;
+use pocketmine\inventory\transaction\TransactionValidationException;
 use pocketmine\item\Item;
 use pocketmine\player\Player;
 
@@ -60,12 +61,16 @@ class SlotChangeAction extends InventoryAction{
 
 	/**
 	 * Checks if the item in the inventory at the specified slot is the same as this action's source item.
+	 *
+	 * @throws TransactionValidationException
 	 */
-	public function isValid(Player $source) : bool{
-		return (
-			$this->inventory->slotExists($this->inventorySlot) and
-			$this->inventory->getItem($this->inventorySlot)->equalsExact($this->sourceItem)
-		);
+	public function validate(Player $source) : void{
+		if(!$this->inventory->slotExists($this->inventorySlot)){
+			throw new TransactionValidationException("Slot does not exist");
+		}
+		if(!$this->inventory->getItem($this->inventorySlot)->equalsExact($this->sourceItem)){
+			throw new TransactionValidationException("Slot does not contain expected original item");
+		}
 	}
 
 	/**