diff --git a/src/alforge/Open.php b/src/alforge/Open.php
index 3edf67e..1047e39 100644
--- a/src/alforge/Open.php
+++ b/src/alforge/Open.php
@@ -13,7 +13,7 @@ public function execute($command)
     {
         $cmdParts = explode(' ', $command);
 
-        if ($cmdParts[1]) {
+        if (isset($cmdParts[1])) {
             $this->respond("https://forge.laravel.com/servers/$cmdParts[0]/sites/$cmdParts[1]");
         } else {
             $this->respond("https://forge.laravel.com/servers/$cmdParts[0]");