diff --git a/app/config/errors.php b/app/config/errors.php
index 266e017e93..741fb406b8 100644
--- a/app/config/errors.php
+++ b/app/config/errors.php
@@ -474,6 +474,11 @@ return [
         'description' => 'Project with the requested ID could not be found. Please check the value of the X-Appwrite-Project header to ensure the correct project ID is being used.',
         'code' => 404,
     ],
+    Exception::ENV_VARIABLE_INCORRECT_SETUP => [
+        'name' => Exception::ENV_VARIABLE_INCORRECT_SETUP,
+        'description' => 'For Custom Domain ENV Variable is not setup correctly',
+        'code' => 501,
+    ],
     Exception::PROJECT_UNKNOWN => [
         'name' => Exception::PROJECT_UNKNOWN,
         'description' => 'The project ID is either missing or not valid. Please check the value of the X-Appwrite-Project header to ensure the correct project ID is being used.',
diff --git a/app/controllers/api/projects.php b/app/controllers/api/projects.php
index 29a193748d..6dc543d2c0 100644
--- a/app/controllers/api/projects.php
+++ b/app/controllers/api/projects.php
@@ -1340,7 +1340,7 @@ App::post('/v1/projects/:projectId/domains')
         $target = new Domain(App::getEnv('_APP_DOMAIN_TARGET', ''));
 
         if (!$target->isKnown() || $target->isTest()) {
-            throw new Exception(Exception::GENERAL_SERVER_ERROR, 'Unreachable CNAME target (' . $target->get() . '), please use a domain with a public suffix.');
+            throw new Exception(Exception::ENV_VARIABLE_INCORRECT_SETUP, 'Unreachable CNAME target (' . $target->get() . '), please use a domain with a public suffix.');
         }
 
         $domain = new Domain($domain);
diff --git a/src/Appwrite/Extend/Exception.php b/src/Appwrite/Extend/Exception.php
index 8b240aa971..35ebc04b0c 100644
--- a/src/Appwrite/Extend/Exception.php
+++ b/src/Appwrite/Extend/Exception.php
@@ -177,6 +177,7 @@ class Exception extends \Exception
     public const DOMAIN_NOT_FOUND                  = 'domain_not_found';
     public const DOMAIN_ALREADY_EXISTS             = 'domain_already_exists';
     public const DOMAIN_VERIFICATION_FAILED        = 'domain_verification_failed';
+    public const ENV_VARIABLE_INCORRECT_SETUP      = 'env_variable_setup_incorrectly';
 
     /** GraphqQL */
     public const GRAPHQL_NO_QUERY                  = 'graphql_no_query';