Fix error Notice: Trying to access offset on value of type null in ... line 843

QUESTION: 

I use your module on M2.3.3 and it works like a charm. However, after upgrading the site to Magento 2.4, an error appeared when importing: 

Notice: Trying to access offset on value of type null in ... on line 843 

How to fix it?

ANSWER: 

To resolve this issue, please edit the file app/code/Bss/ProductAttributesImportExport/Model/Import/ProductAttributes.php 

 as below:

Or download the attached file below and overwrite the current file on your site.

If you have any other question or concern, please feel free to contact us. We'd be happy to support!