HMVC broken in php 7.3 -- help

Hi, 

I am using the HMVC and on php7.3, I get this: 

Code:

A PHP Error was encountered

Severity: 8192

Message: strpos(): Non-string needles will be interpreted as strings in the future. Use an explicit chr() call to preserve the current behavior

Filename: MX/Router.php

Line Number: 239

Backtrace:

File: /web/application/third_party/MX/Router.php
Line: 239
Function: strpos

File: /web/application/third_party/MX/Router.php
Line: 101
Function: _set_default_controller

File: /web/public/index.php
Line: 315
Function: require_once

Though this is a CI forum,  I do not know how to ask help from the HMVC page: https://bitbucket.org/wiredesignz/codeig...sions-hmvc
If someone knows what to do, please let me know. 
Thanks