diff --git a/app/Http/Controllers/Module/DeviceController.php b/app/Http/Controllers/Module/DeviceController.php
index e52944e..cc7fcb2 100644
--- a/app/Http/Controllers/Module/DeviceController.php
+++ b/app/Http/Controllers/Module/DeviceController.php
@@ -43,7 +43,7 @@ public function destroy(Request $request, $client_id = null): JsonResponse
         if ($client_id) {
             try {
                 $client = $emqx->client($client_id);
-            } catch (EmqxSupportException $e) {
+            } catch (EmqxSupportException) {
                 return $this->failed('client not found');
             }