diff --git a/addons/default/visiosoft/cats-module/resources/lang/sr/message.php b/addons/default/visiosoft/cats-module/resources/lang/sr/message.php
index 6b47a740e..920bdc11b 100644
--- a/addons/default/visiosoft/cats-module/resources/lang/sr/message.php
+++ b/addons/default/visiosoft/cats-module/resources/lang/sr/message.php
@@ -2,4 +2,5 @@
 
 return [
     'categories_mass_delete_success' => 'Kategorije i srodne podkategorije su uspešno izbrisane!',
+    'cat_slug_exists' => 'A category with a slug of :slug already exists!',
 ];