diff --git a/app/Controller/api/expose/v1/ToolsController.php b/app/Controller/api/expose/v1/ToolsController.php
index c2d5ba9..51226f2 100644
--- a/app/Controller/api/expose/v1/ToolsController.php
+++ b/app/Controller/api/expose/v1/ToolsController.php
@@ -27,8 +27,8 @@ class ToolsController extends AbstractController
         if ($keyword) {
             $query = $keyword->first()?->toArray();
             if ($query) {
-                $ignoreUrl = AppKeywordsMonitor::formatQuery([])->where('id', $query['aid'])->first()?->toArray()['ignore_url'] ?? [];
-                $query['ignore_url'] = $ignoreUrl;
+                $ignoreUrl = AppKeywordsMonitor::formatQuery([])->where('id', $query['aid'])->first()?->toArray()['ignore_url'] ?? '[]';
+                $query['ignore_url'] = $ignoreUrl ?: '[]';
             }
             return $this->response->json([
                 'code' => 0,