diff --git a/HttpServer/Events/OnWorkerStart.php b/HttpServer/Events/OnWorkerStart.php
index 457ded07..fe9ff7dd 100644
--- a/HttpServer/Events/OnWorkerStart.php
+++ b/HttpServer/Events/OnWorkerStart.php
@@ -74,6 +74,7 @@ class OnWorkerStart extends Callback
                 return $server->stop($worker_id, true);
             }
             while (Co::stats()['coroutine_num'] > 0) {
+                var_dump(Co::stats()['coroutine_num']);
                 Coroutine::sleep(0.01);
             }
             return $server->stop($worker_id, true);