Strange E_ERROR in version 1.4.11

Hi,

I’m getting a very strange error on my local install. It’s been working before and is working for other people on my team.
We have the same exact environment (docker) and exactly the same codebase, still, I’m experiencing the below error.

Judging from the error message in the “Site is experiencing Technical Issues” email sent by WordPress it looks like it’s having trouble parsing the response from Pardot.

Any ideas or suggestions as to why this might be happening?

WordPress version 5.3.2
Current theme: Aditro (version 2.0)
Current plugin: Pardot (version 1.4.11)
PHP version 7.3.11-1+ubuntu18.04.1+deb.sury.org+1

Error Details
=============
An error of type E_ERROR was caused in line 451 of the file /wordpress/wp-content/plugins/pardot/includes/pardot-api-class.php. Error message: Uncaught Exception: String could not be parsed as XML in /wordpress/wp-content/plugins/pardot/includes/pardot-api-class.php:451
Stack trace:
#0 /wordpress/wp-content/plugins/pardot/includes/pardot-api-class.php(451): SimpleXMLElement->__construct(”)
#1 /wordpress/wp-content/plugins/pardot/includes/pardot-api-class.php(162): Pardot_API->get_response(‘campaign’, Array)
#2 /wordpress/wp-content/plugins/pardot/includes/pardot-plugin-class.php(1056): Pardot_API->get_campaigns(Array)
#3 /wordpress/wp-content/plugins/pardot/includes/pardot-plugin-class.php(998): Pardot_Plugin::call_api(‘campaigns’, Array)
#4 /wordpress/wp-content/plugins/pardot/includes/pardot-settings-class.php(757): Pardot_Plugin::get_campaigns()
#5 [internal function]: Pardot_Settings->campaign_field(Array)
#6 /wordpress/wp-admin/includes/template.php(1690): call_user_func(Array, Array)
#7 /wordpress/wp-admin/includes/template.php(1648): do_settings_fields(‘pardot’, ‘pardot_settings’)
#8 /wordpress/wp-content/plugins/pardot/includes/pardot-setti