Only variable references should be returned by reference

搭建完Lepus监控系统后，界面提示错误：
A PHP Error was encountered

Severity: Notice

Message: Only variable references should be returned by reference

Filename: core/Common.php

Line Number: 257

[root@b77-11-100 lepus_v3.7]# find / -name Common.php
/opt/lampp/htdocs/system/core/Common.php

修改如下内容
return $_config[0] =& $config;
为
$_config[0] =& $config;
return $_config[0];