Make registration errors still work properly when debug mode is on

framework/core/src/Frontend/HtmlDocumentFactory.php

@@ -128,6 +128,8 @@ class HtmlDocumentFactory
     {
         $actor = $request->getAttribute('actor');
 
+        $this->api->setErrorHandler(null);
+
         return $this->getResponseBody(
             $this->api->send(ShowForumController::class, $actor)
         );