diff --git a/app/common.php b/app/common.php
index cb743be..5e1f1fc 100644
--- a/app/common.php
+++ b/app/common.php
@@ -225,6 +225,7 @@ function check_permission($key,$admin_id = null)
   $model_permission = Cache::get($cache_key);
   if (empty($model_permission)) {
     $model_permission = AdminPermission::where('key',$key)->find();
+    Cache::set($cache_key,$model_permission);
   }
 
   if (empty($model_permission)) {
diff --git a/database/seeds/InitAdminPermission.php b/database/seeds/InitAdminPermission.php
index b081f55..f0624b0 100644
--- a/database/seeds/InitAdminPermission.php
+++ b/database/seeds/InitAdminPermission.php
@@ -15,7 +15,7 @@ class InitAdminPermission extends Seeder
      */
     public function run()
     {
-        $permission_content = '';
+        $permission_content = '{}';
 
         $permissions = json_decode($permission_content,true);