diff --git a/README.md b/README.md
index b9e2e1888..6f2b715ab 100644
--- a/README.md
+++ b/README.md
@@ -65,6 +65,8 @@ PocketMine-MP accepts community contributions! The following resources will be u
  * [Building and running PocketMine-MP from source](BUILDING.md)
  * [Contributing Guidelines](CONTRIBUTING.md)
 
+New here? Check out [issues with the "Easy task" label](https://github.com/pmmp/PocketMine-MP/issues?q=is%3Aissue%20state%3Aopen%20label%3A%22Easy%20task%22) for things you could work to familiarise yourself with the codebase.
+
 ## Donate
 PocketMine-MP is free, but it requires a lot of time and effort from unpaid volunteers to develop. Donations enable us to keep delivering support for new versions and adding features your players love.
 
diff --git a/src/crafting/ShapedRecipe.php b/src/crafting/ShapedRecipe.php
index 4c40eb0f5..2af3f5134 100644
--- a/src/crafting/ShapedRecipe.php
+++ b/src/crafting/ShapedRecipe.php
@@ -97,6 +97,7 @@ class ShapedRecipe implements CraftingRecipe{
 
 		$this->shape = $shape;
 
+		Utils::validateArrayValueType($ingredients, function(RecipeIngredient $_) : void{});
 		foreach(Utils::stringifyKeys($ingredients) as $char => $i){
 			if(!str_contains(implode($this->shape), $char)){
 				throw new \InvalidArgumentException("Symbol '$char' does not appear in the recipe shape");
@@ -105,6 +106,7 @@ class ShapedRecipe implements CraftingRecipe{
 			$this->ingredientList[$char] = clone $i;
 		}
 
+		Utils::validateArrayValueType($results, function(Item $_) : void{});
 		$this->results = Utils::cloneObjectArray($results);
 	}
 
diff --git a/src/crafting/ShapelessRecipe.php b/src/crafting/ShapelessRecipe.php
index 7a4a22fda..b139439ef 100644
--- a/src/crafting/ShapelessRecipe.php
+++ b/src/crafting/ShapelessRecipe.php
@@ -53,7 +53,9 @@ class ShapelessRecipe implements CraftingRecipe{
 		if(count($ingredients) > 9){
 			throw new \InvalidArgumentException("Shapeless recipes cannot have more than 9 ingredients");
 		}
+		Utils::validateArrayValueType($ingredients, function(RecipeIngredient $_) : void{});
 		$this->ingredients = $ingredients;
+		Utils::validateArrayValueType($results, function(Item $_) : void{});
 		$this->results = Utils::cloneObjectArray($results);
 	}