diff --git a/app/Http/Controllers/V1/Client/ClientController.php b/app/Http/Controllers/V1/Client/ClientController.php
index 2824635..1e4a7cc 100644
--- a/app/Http/Controllers/V1/Client/ClientController.php
+++ b/app/Http/Controllers/V1/Client/ClientController.php
@@ -94,7 +94,7 @@ class ClientController extends Controller
      */
     private function isBrowserAccess(Request $request): bool
     {
-        $userAgent = strtolower($request->input('flag', $request->header('User-Agent')));
+        $userAgent = strtolower($request->input('flag', $request->header('User-Agent', '')));
         return str_contains($userAgent, 'mozilla')
             || str_contains($userAgent, 'chrome')
             || str_contains($userAgent, 'safari')
diff --git a/app/Models/Coupon.php b/app/Models/Coupon.php
index f9a9e42..7d330a3 100644
--- a/app/Models/Coupon.php
+++ b/app/Models/Coupon.php
@@ -19,7 +19,7 @@ class Coupon extends Model
 
     public function getLimitPeriodAttribute($value)
     {
-        return collect(json_decode($value, true))->map(function ($item) {
+        return collect(json_decode((string) $value, true))->map(function ($item) {
             return PlanService::getPeriodKey($item);
         })->toArray();
     }
diff --git a/app/Utils/Helper.php b/app/Utils/Helper.php
index b7df1cf..befc068 100644
--- a/app/Utils/Helper.php
+++ b/app/Utils/Helper.php
@@ -90,7 +90,7 @@ class Helper
         return true;
     }
 
-    public static function trafficConvert(int $byte)
+    public static function trafficConvert(float $byte)
     {
         $kb = 1024;
         $mb = 1048576;