diff --git a/app/controllers/api/proxy.php b/app/controllers/api/proxy.php
index 7f063bd495..514b21fe47 100644
--- a/app/controllers/api/proxy.php
+++ b/app/controllers/api/proxy.php
@@ -61,8 +61,11 @@ App::post('/v1/proxy/rules')
             throw new Exception(Exception::GENERAL_ARGUMENT_INVALID, 'You cannot assign your main domain to specific resource. Please use subdomain or a different domain.');
         }
 
-        $deniedDomains = System::getEnv('_APP_CUSTOM_DOMAIN_DENY_LIST', '');
+        $denyListString = System::getEnv('_APP_CUSTOM_DOMAIN_DENY_LIST', '');
+        $deniedDomains = array_map('trim', explode(',', $denyListString));
+        var_dump($deniedDomains);
         foreach ($deniedDomains as $deniedDomain) {
+            var_dump(str_ends_with($domain, $deniedDomain));
             if (str_ends_with($domain, $deniedDomain)) {
                 throw new Exception(Exception::GENERAL_ARGUMENT_INVALID, 'You cannot assign your functions domain or its subdomain to a specific resource. Please use a different domain.');
             }