diff --git a/core/imageboard/image.php b/core/imageboard/image.php
index 67edec76..0c9e1160 100644
--- a/core/imageboard/image.php
+++ b/core/imageboard/image.php
@@ -267,8 +267,8 @@ class Image
         if (!$fp) {
             return null;
         }
-		$_tracer->begin("Query Accelerator", null, ["req"=>$req_str]);
 		$req_str = json_encode($req);
+		$_tracer->begin("Query Accelerator", null, ["req"=>$req_str]);
         fwrite($fp, $req_str);
         $data = "";
         while (($buffer = fgets($fp, 4096)) !== false) {