diff --git a/core/modules/comment/comment.module b/core/modules/comment/comment.module
index d69ea94..f55cef7 100644
--- a/core/modules/comment/comment.module
+++ b/core/modules/comment/comment.module
@@ -1884,7 +1884,9 @@ function comment_preview($comment) {
   $node = node_load($comment->nid);
 
   if (!form_get_errors()) {
-    $comment->format = $comment->comment_body[LANGUAGE_NONE][0]['format'];
+    if(isset($comment->comment_body[LANGUAGE_NONE][0]['format'])){
+      $comment->format = $comment->comment_body[LANGUAGE_NONE][0]['format'];
+    }
     // Attach the user and time information.
     if (!empty($comment->name)) {
       $account = user_load_by_name($comment->name);