Agile Authorize.Net Credit Card Payment (Undefined error)

[zion.electronics_15757]

When customers try to check out on my website they are seeing this error in a red box
undefined index: id_order
and a link leading to the line 33 on agileauthorizenet.php

When is the issue with this and how can we get it fixed asap? This is prestashop 1.7

[zion.electronics_15757]

for your reference

[shokinro]

thanks for using our modules.
Please contact [email protected] with following info so that we can take a look at your store
- store admin
- store FTP
- details of the issues and how to reproduce.