diff --git a/actions/logged_in/save.php b/actions/logged_in/save.php
index 080a9eb..ed6069a 100644
--- a/actions/logged_in/save.php
+++ b/actions/logged_in/save.php
@@ -15,7 +15,6 @@
 global $CONFIG;
 $error = FALSE;
 
-
 // check if from is validated
 if(!IzapBase::hasFormError()) {
 
@@ -74,6 +73,6 @@
 }
 
 if($error) {
-  register_error(elgg);
+  register_error(elgg_Echo('izap-threaded-comments:form_not_validated'));
 }
 echo $html_output;
\ No newline at end of file
diff --git a/languages/en.php b/languages/en.php
index f7e7627..243dda4 100644
--- a/languages/en.php
+++ b/languages/en.php
@@ -17,5 +17,6 @@
   'comments_rss' => 'Subscribe the comments feed',
   'rss_page_title' => 'Rss feed for the comments',
   'izap-threaded-comments:has_commented_on' => 'has commented on',
+   'izap-threaded-comments:form_not_validated'  => 'Empty comment',
   
 );add_translation('en', $english);
\ No newline at end of file