--- a/comment_control.module	2015-07-22 12:21:14.000000000 -0300
+++ b/comment_control.module	2016-03-11 08:55:12.514802691 -0300
@@ -159,7 +159,7 @@
 
   $word_list = explode(PHP_EOL, comment_control_get_words() . PHP_EOL . comment_control_get_bad_words());
   foreach ($word_list as $word) {
-    if (mb_stripos($comment->comment_body['und'][0]['value'], comment_control_mb_trim($word)) !== false) {
+    if (!empty($word) && mb_stripos($comment->comment_body['und'][0]['value'], comment_control_mb_trim($word)) !== false) {
 
       $comment->status = COMMENT_NOT_PUBLISHED;
       db_update('comment')