diff --git a/src/Controller/ViewerController.php b/src/Controller/ViewerController.php
index 880d37a9..0c283a9a 100644
--- a/src/Controller/ViewerController.php
+++ b/src/Controller/ViewerController.php
@@ -17,6 +17,7 @@
 use Drupal\collabora_online\Exception\CollaboraNotAvailableException;
 use Drupal\Core\Controller\ControllerBase;
 use Drupal\Core\Render\RendererInterface;
+use Drupal\Core\Utility\Error;
 use Drupal\media\Entity\Media;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
@@ -62,15 +63,12 @@ public function editor(Media $media, Request $request, $edit = FALSE) {
             $wopi_client_url = $this->discovery->getWopiClientURL();
         }
         catch (CollaboraNotAvailableException $e) {
-            $error_msg = $this->t('The Collabora Online server is not available: @message', [
-                '@message' => $e->getCode() . ': ' . $e->getMessage(),
-            ]);
-            $error_msg = $this->t('Viewer error: @message', [
-                '@message' => $error_msg,
-            ]);
-            $this->getLogger('cool')->error($error_msg);
+            $this->getLogger('cool')->warning(
+                "Collabora Online is not available.<br>\n" . Error::DEFAULT_ERROR_MESSAGE,
+                Error::decodeException($e) + [],
+            );
             return new Response(
-                $error_msg,
+                $this->t('The Collabora Online editor/viewer is not available.'),
                 Response::HTTP_BAD_REQUEST,
                 ['content-type' => 'text/plain'],
             );