diff --git a/src/Request.php b/src/Request.php
index 0f8367d..4ac3a01 100644
--- a/src/Request.php
+++ b/src/Request.php
@@ -148,6 +148,8 @@ protected function exec(){
         try {
             return json_decode($this->send(),true);
         }catch (RequestException $e){
+            if(empty($e->getResponse()) || $e->getResponse()==null) throw new Exception(json_encode(['_message'=>'system error']));
+
             if(method_exists($e->getResponse(),'getBody')){
                 $contents=$e->getResponse()->getBody()->getContents();