修改报错

app/Admin/Controllers/LanzuAdminUserMarketController.php

@@ -22,10 +22,10 @@ class LanzuAdminUserMarketController extends AdminController
         return Grid::make(new LanzuAdminUserMarket(), function (Grid $grid) {
             $grid->column('id')->sortable();
             $grid->column('admin_user_id','用户名')->display(function (){
-                 return AdminUsers::where('id',$this->admin_user_id)->first()->name;
+                 return AdminUsers::where('id',$this->admin_user_id)->first()->name ?? '';
             });
             $grid->column('market_id','关联市场')->display(function (){
-                return Market::where('id',$this->market_id)->first()->name;
+                return Market::where('id',$this->market_id)->first()->name ?? '';
             });
             $grid->column('created_at')->display(function ($time){
                 return date('Y-m-d H:i:s',$time);