M2.2.x: Fix the issue die site when disabling the config show unit price and tier price

Issue:

I am using Magento 2 Configurable Product Matrix View ver 1.1.7 on Magento 2.2.9. When I set up the config Show Unit Price = No and Show Tier Price = No, the site does not work anymore.

It gets this error:

1 exception(s):

Exception #0 (Exception): Notice: Underfined offset: 15890 in /app/code/Bss/ConfigurableMatrixView/Plugin/Block/View/Configurable.php on line 395

Solution: 

This issue is caused due to our module's bug on Magento 2.2.x.

Hence, we would like to give the solution to hot-fix it.

We have made change on this file app/code/Bss/ConfigurableMatrixView/Plugin/Block/View/Configurable.php

Please follow our guide and apply the fix on your site.

If you need any assistance, please don't hesitate to contact us.

We'd like to help.