From acb1c611ebe39e07ded91ea20146d8d715e16978 Mon Sep 17 00:00:00 2001
From: Zach Daniel <zach@zachdaniel.dev>
Date: Thu, 19 Dec 2024 13:43:54 -0500
Subject: [PATCH] fix: handle nil values in `Ash.Type.Module`

---
 lib/ash/type/module.ex | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lib/ash/type/module.ex b/lib/ash/type/module.ex
index d483605e8..ec186e059 100644
--- a/lib/ash/type/module.ex
+++ b/lib/ash/type/module.ex
@@ -84,6 +84,8 @@ defmodule Ash.Type.Module do
   end
 
   @impl true
+  def cast_input(nil, _), do: {:ok, nil}
+
   def cast_input(value, _) when is_atom(value) do
     if Code.ensure_loaded?(value) do
       {:ok, value}