[v1.0.6]. How to fix the issue with used code?

Issue: 

I have used module version 1.06 on M2.4.1. However, when I try to check a used code it gives me an error

Solution:

The issue happens due to the module's bug.

To solve the issue, we have modified two files as below

app/code/Bss/GiftCard/Model/ResourceModel/Pattern/History/Collection.php

app/code/Bss/GiftCard/Observer/SalesOrderAfterPlace.php

Please apply two files to fix the issue.

If you have any issues, please feel free to contact us.

We'd like to help.