diff --git a/src/Client.php b/src/Client.php
index 867e297..ee6cd1a 100644
--- a/src/Client.php
+++ b/src/Client.php
@@ -253,6 +253,7 @@ protected function connectionReady(): void
 
     public function close(): void
     {
+        Timer::clear($this->getPingTimer());
         $this->client->close();
         $this->client = null;
     }