diff --git a/AsyncClient.php b/AsyncClient.php
index 954f1ed..c79eb5e 100644
--- a/AsyncClient.php
+++ b/AsyncClient.php
@@ -172,7 +172,7 @@ class AsyncClient extends ClientAbstracts
 	 */
 	public function close(): void
 	{
-		if (!$this->client->connected) {
+		if (!$this->client || !$this->client->connected) {
 			return;
 		}
 		$this->client->close();