From a0797da229a41da7f380d1989b48a265633db34f Mon Sep 17 00:00:00 2001
From: Chris Roberts <croberts@hashicorp.com>
Date: Wed, 17 Nov 2021 14:53:15 -0800
Subject: [PATCH] Argument is only invalid if nil and expected type is not
 NilClass

---
 plugins/commands/serve/mappers/mapper.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/plugins/commands/serve/mappers/mapper.rb b/plugins/commands/serve/mappers/mapper.rb
index 1be596fb2..fa3273812 100644
--- a/plugins/commands/serve/mappers/mapper.rb
+++ b/plugins/commands/serve/mappers/mapper.rb
@@ -176,7 +176,7 @@ module VagrantPlugins
               value = args.detect do |arg|
                 input.valid?(arg)
               end
-              if !value
+              if value.nil? && input.type != NilClass
                 raise ArgumentError,
                   "Failed to locate required argument of type `#{input.type}'"
               end