diff --git a/src/Xhgui/Saver/Mongo.php b/src/Xhgui/Saver/Mongo.php
index f3c2f7b47..74eb4fa6f 100644
--- a/src/Xhgui/Saver/Mongo.php
+++ b/src/Xhgui/Saver/Mongo.php
@@ -19,7 +19,9 @@ public function __construct(MongoCollection $collection)
 
     public function save(array $data)
     {
-        $data['_id'] = self::getLastProfilingId();
+        if (!isset($data['_id'])) {
+            $data['_id'] = self::getLastProfilingId();
+        }
 
         if (isset($data['meta']['request_ts'])) {
             $data['meta']['request_ts'] = new MongoDate($data['meta']['request_ts']['sec']);