New user registration blocked by Joomdle Error message

Hello,

My client has the latest Joomdle extension (2.3.1) installed on their site running Joomla 5.2.5

Users can register and then activate their accounts from an email link.

When they click the link, however, they get a blank screen with just one message that reads:

COM_JOOMDLE_WEB_SERVICES_ERROR: array_key_exists(): Argument #2 ($array) must be of type array, null given

This is regardless of whether the email address exists in Moodle. Though in Moodle I see a message saying: "The web service function 'joomdle_create_joomdle_user' has been called."

I turned off the option to auto create a user in Moodle but it made no difference.

Any help would be much appreciated.

Regards, Dan

I think Autocreate user was the issue as it seems to have "gone away" after I changed that setting