diff --git a/src/HttpApi/Controllers/Controller.php b/src/HttpApi/Controllers/Controller.php
index 92315c2..6d2c79a 100644
--- a/src/HttpApi/Controllers/Controller.php
+++ b/src/HttpApi/Controllers/Controller.php
@@ -52,7 +52,7 @@ abstract class Controller implements HttpServerInterface
     {
         return Collection::make($headers)->first(function ($values, $header) {
             return strtolower($header) === 'content-length';
-        });
+        })[0] ?? 0;
     }
 
     public function onMessage(ConnectionInterface $from, $msg)