diff --git a/app/controllers/api/proxy.php b/app/controllers/api/proxy.php
index 29f39c55af..f60a639302 100644
--- a/app/controllers/api/proxy.php
+++ b/app/controllers/api/proxy.php
@@ -51,7 +51,7 @@ App::post('/v1/proxy/rules')
         }
 
         $functionsDomain = System::getEnv('_APP_DOMAIN_FUNCTIONS', '');
-        if (str_ends_with($domain, $functionsDomain)) {
+        if ($functionsDomain != '' && str_ends_with($domain, $functionsDomain)) {
             throw new Exception(Exception::GENERAL_ARGUMENT_INVALID, 'You cannot assign your functions domain or it\'s subdomain to specific resource. Please use different domain.');
         }