diff --git a/app/Http/Controllers/Admin/SystemController.php b/app/Http/Controllers/Admin/SystemController.php
index 2628bcb5..a6f6505d 100644
--- a/app/Http/Controllers/Admin/SystemController.php
+++ b/app/Http/Controllers/Admin/SystemController.php
@@ -104,6 +104,10 @@ class SystemController extends Controller
         $name = $request->input('name');
         $value = $request->input('value');
 
+        if (empty($value)) { // 关闭 或 空值 自动设NULL，减少系统设置存储
+            $value = null;
+        }
+
         // 支付设置判断
         if ($value !== null && in_array($name, ['is_AliPay', 'is_QQPay', 'is_WeChatPay', 'is_otherPay'], true) && ! in_array($value, $this->getPayment(), true)) {
             return Response::json(['status' => 'fail', 'message' => '请先完善该支付渠道的必要参数！']);
diff --git a/resources/views/admin/config/system.blade.php b/resources/views/admin/config/system.blade.php
index 8cbf1ecd..90d907f5 100644
--- a/resources/views/admin/config/system.blade.php
+++ b/resources/views/admin/config/system.blade.php
@@ -434,9 +434,9 @@
                                                     <input type="number" class="form-control" id="user_invite_days" value="{{$user_invite_days}}"/>
                                                     <div class="input-group-append">
                                                         <span class="input-group-text">天</span>
-                                                        <button class="btn btn-primary" type="button"
-                                                                onchange="updateFromOther('user_invite_days','1',false)">{{trans('common.update')}}</button>
                                                     </div>
+                                                    <button class="btn btn-primary" type="button"
+                                                            onclick="updateFromInput('user_invite_days','1',false)">{{trans('common.update')}}</button>
                                                 </div>
                                                 <span class="text-help"> 用户自行生成邀请的有效期 </span>
                                             </div>