Deleting of contributions with donation receipt fails silently - no error message displayed

[Detsieber]

Deleting of contributions with donation receipt fails - this is, of course, the required behaviour!
However, it fails silently, without displaying any error message and leaving the user uninformed what happened.
ConfigAndLog contains the following:

 [error] 
$Fatal Error Details = array:3 [
  "message" => "Zuwendung [5213] kann nicht gelöscht werden, da für sie eine Zuwendungsbescheinigung vorliegt, oder gerade erstellt wird."
  "code" => null
  "exception" => Exception {#16211
    #message: "Zuwendung [5213] kann nicht gelöscht werden, da für sie eine Zuwendungsbescheinigung vorliegt, oder gerade erstellt wird."
    #code: 0
    #file: "/html/wordpress/wp-content/uploads/civicrm/ext/de.systopia.donrec/donrec.php"
    #line: 337
    trace: {
      /html/wordpress/wp-content/uploads/civicrm/ext/de.systopia.donrec/donrec.php:337 {
        ›   $message = sprintf(E::ts("This contribution [%d] must not be deleted because it has a receipt or is going to be receipted!"), $id);
        ›   throw new Exception($message);
        › }
      }
      /html/wordpress/wp-content/plugins/civicrm/civicrm/CRM/Utils/Hook.php:283 { …}
      /html/wordpress/wp-content/plugins/civicrm/civicrm/CRM/Utils/Hook/WordPress.php:136 { …}
      /html/wordpress/wp-content/plugins/civicrm/civicrm/Civi/Core/CiviEventDispatcher.php:180 { …}
      /html/wordpress/wp-content/plugins/civicrm/civicrm/vendor/symfony/event-dispatcher/EventDispatcher.php:214 { …}
      /html/wordpress/wp-content/plugins/civicrm/civicrm/vendor/symfony/event-dispatcher/EventDispatcher.php:44 { …}
      /html/wordpress/wp-content/plugins/civicrm/civicrm/Civi/Core/CiviEventDispatcher.php:129 { …}
      /html/wordpress/wp-content/plugins/civicrm/civicrm/CRM/Utils/Hook.php:344 { …}
      /html/wordpress/wp-content/plugins/civicrm/civicrm/CRM/Contribute/BAO/Contribution.php:1438 { …}
      /html/wordpress/wp-content/plugins/civicrm/civicrm/CRM/Contribute/Form/Contribution.php:935 { …}
      /html/wordpress/wp-content/plugins/civicrm/civicrm/CRM/Core/Form.php:526 { …}
      /html/wordpress/wp-content/plugins/civicrm/civicrm/CRM/Core/StateMachine.php:144 { …}
      /html/wordpress/wp-content/plugins/civicrm/civicrm/CRM/Core/QuickForm/Action/Next.php:43 { …}
      /html/wordpress/wp-content/plugins/civicrm/civicrm/packages/HTML/QuickForm/Controller.php:203 { …}
      /html/wordpress/wp-content/plugins/civicrm/civicrm/packages/HTML/QuickForm/Page.php:103 { …}
      /html/wordpress/wp-content/plugins/civicrm/civicrm/CRM/Core/Controller.php:347 { …}
      /html/wordpress/wp-content/plugins/civicrm/civicrm/CRM/Contribute/Page/Tab.php:312 { …}
      /html/wordpress/wp-content/plugins/civicrm/civicrm/CRM/Contribute/Page/Tab.php:368 { …}
      /html/wordpress/wp-content/plugins/civicrm/civicrm/CRM/Core/Invoke.php:313 { …}
      /html/wordpress/wp-content/plugins/civicrm/civicrm/CRM/Core/Invoke.php:69 { …}
      /html/wordpress/wp-content/plugins/civicrm/civicrm/CRM/Core/Invoke.php:36 { …}
      /html/wordpress/wp-content/plugins/civicrm/civicrm.php:1172 { …}
      /html/wordpress/wp-includes/class-wp-hook.php:292 { …}
      /html/wordpress/wp-includes/class-wp-hook.php:316 { …}
      /html/wordpress/wp-includes/plugin.php:484 { …}
      /html/wordpress/wp-admin/admin.php:259 { …}
    }
  }
]

This might relate to Wordpress only. Versions:
CiviCRM 5.36.1
Donrec 2.0
Wordpress 5.7.2