diff --git a/src/Service/FCMSender.php b/src/Service/FCMSender.php
index 8130fe1a..412ba6af 100644
--- a/src/Service/FCMSender.php
+++ b/src/Service/FCMSender.php
@@ -71,9 +71,9 @@ class FCMSender
         foreach ($sessions as $sess) {
             $device_id = $sess->getDevicePushID();
 
-            if (!empty($device_id)) {
+            if (!empty($device_id) && !isset($device_ids[$device_id])) {
                 // send fcm notification
-                $device_ids[] = $device_id;
+                $device_ids[$device_id] = true;
             }
         }
 
@@ -87,7 +87,7 @@ class FCMSender
         $data['jo_status'] = $job_order->getStatus();
 
         // send fcm notification
-        $result = $this->send($device_ids, $this->translator->trans($title), $this->translator->trans($body), $data);
+        $result = $this->send(array_keys($device_ids), $this->translator->trans($title), $this->translator->trans($body), $data);
 
         return $result;
     }