From a9cc7c73d2928260236dbdc5818e5b1fd901b64c Mon Sep 17 00:00:00 2001
From: Matthew Kent <matthew@37signals.com>
Date: Sat, 11 Nov 2023 12:57:31 -0800
Subject: [PATCH] Handle an undefined primary_web_role.

---
 lib/kamal/configuration.rb | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/lib/kamal/configuration.rb b/lib/kamal/configuration.rb
index 64c74c63..f7f2233c 100644
--- a/lib/kamal/configuration.rb
+++ b/lib/kamal/configuration.rb
@@ -263,6 +263,10 @@ class Kamal::Configuration
         end
       end
 
+      unless role_names.include?(primary_web_role)
+        raise ArgumentError, "The primary_web_role #{primary_web_role} isn't defined"
+      end
+
       unless traefik_role_names.include?(primary_web_role)
         raise ArgumentError, "Role #{primary_web_role} needs to have traefik enabled"
       end