更新

app/Admin/Controllers/DynamicController.php

@@ -25,7 +25,7 @@ class DynamicController extends AdminController
         $grid->column('id')->sortable();
         $grid->column('user_info.avatar','头像')->image("",50);;
         $grid->column('user_id','用户')->display(function (){
-            if(isset($this->user_info->nickname)){
+            if(isset($this->user_info->nickname)&&isset($this->user->mobile)){
                 return $this->user->mobile.'<br>'.$this->user_info->nickname;
             }else{
                 return "";