MySQL error using Joomdle CbSubs Plugin

When we subscribe a user to the CBSubs plan, from both the backend or frontend, we receive an error that says:

We're using CB Paid Subscriptions version 4.5.3+build.2022.02.01.10.46.06.27f67b177

I've emailed you the package.

Yes, the error only occurs on the specific plan with Joomdle in use, and when we disable the Joomdle course assignment the plan the error doesn't occur. I think all other CB Subs plugins are CB-developed. I'm attaching a screenshot of our other CB Subs plugins.

Users are being synced to Moodle as expected via CB, so the mysql connection error is specific to Joomdle in CB Subs.

Also, on the plan edit screen we're shown this message in a red warning:

"The CBSubs integration plugin 'CBSubs Joomdle' is for another CBSubs version 4.3.0."

I think I've found the issue and corrected it, and then the subscription to the CB Subs plan successfully enrolled me in the Moodle course.

The CBSubs SQL Action tab had an "external" radio option checked, so I guess that was causing it to try and connect to empty server settings.