diff --git a/src/Client.php b/src/Client.php
index c1ded5e..675f39c 100644
--- a/src/Client.php
+++ b/src/Client.php
@@ -77,9 +77,7 @@ public function send($data, array $registrationIds = [], array $options = [])
     {
         $this->responses = [];
 
-        $data = array_merge($options, [
-            'data' => $data,
-        ]);
+        $data = !empty($data) ? array_merge($options, array('data' => $data)) : $options;
 
         if (isset($options['to'])) {
             $this->responses[] = $this->browser->post($this->apiUrl, $this->getHeaders(), json_encode($data));