后台-推荐人/节点人/身份修改-修复错误

app/controller/admin/user/User.php

@@ -854,7 +854,11 @@ class User extends BaseController
     public function changeProLevel($id,UserRepository $repository) {
         $level_account = $this->request->param('level_account');
         $level_account_old = $this->request->param('level_account_old');
-        $account = explode('(', $level_account_old)[0];
+        $account = '';
+        if (!empty($level_account_old)) {
+            $parts = explode('(', $level_account_old);
+            $account = $parts[0];
+        }
         $adminId = $this->request->adminId();
         $mark = $this->request->param('mark');
         if (empty($mark)) {