iOS Bug---UIAlertController exception log

        UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"提示" message:@"请在iPhone的“设置”-“隐私”-“相机”功能中，找到“XXXXXX”打开相机访问权限" preferredStyle:UIAlertControllerStyleAlert];

        UIAlertAction *ok = [UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDefault handler:^(UIAlertAction *action) {
        }];

        // 将UIAlertAction添加到UIAlertController中
        [alertController addAction:ok];

        // present显示
        [self presentViewController:alertController animated:YES completion:nil];

log：

pushViewController:animated: called on <NavigationViewController 0x12c081a00> while an existing transition or presentation is occurring; the navigation stack will not be updated.

I don't know how to remove this log. . .