@@ -80,6 +80,12 @@ class ModuleRegistration extends \Contao\ModuleRegistration

     }

     $this->editable = $arrEditable;

+    // Prevent empty password exception in Contao >= 4.8 in password not username validation

+    if (\Input::post('FORM_SUBMIT') == 'tl_registration_' . $this->id && \Input::post('username') == '' && \Input::post('email'))

+    {

+      \Input::setPost('username',\Input::post('email'));

+    }

+

     parent::compile();

   }