diff --git a/core/modules/comment/comment.module b/core/modules/comment/comment.module
index ea905f5..ad85186 100644
--- a/core/modules/comment/comment.module
+++ b/core/modules/comment/comment.module
@@ -433,6 +433,7 @@ function comment_node_links_alter(array &$node_links, NodeInterface $node, array
   // can do so by implementing a new field formatter.
   // @todo Make this configurable from the formatter see
   //   http://drupal.org/node/1901110
+  $view_mode = $context['view_mode'];
   if ($view_mode == 'search_index' || $view_mode == 'search_result' || $view_mode == 'print') {
     // Do not add any links if the entity displayed for:
     // - search indexing.