diff --git a/app/crm/utils/Util.php b/app/crm/utils/Util.php
index 586ee45..0701f5e 100644
--- a/app/crm/utils/Util.php
+++ b/app/crm/utils/Util.php
@@ -126,9 +126,14 @@ class Util
 
     public static function mask($str)
     {
+        $length = strlen($str);
+
         if(empty($str)){
             return '';
         }
+        if($length <= 6){
+            return $str;
+        }
         return substr($str, 0, 3) . '****' . substr($str, -4);
     }