diff --git a/assets/modules/letters/classes/Templates.php b/assets/modules/letters/classes/Templates.php
index 28dcd8a..837df64 100644
--- a/assets/modules/letters/classes/Templates.php
+++ b/assets/modules/letters/classes/Templates.php
@@ -56,7 +56,7 @@ public function InsOrUpdTemplate($data,$id){
         }
         $keys = implode(',',array_keys($res));
         $values = implode(',',array_values($res));
-        $duplicate = '';
+        $duplicate = array();
         foreach ($res as $key => $value){
             if (!intval($value)){
                 $duplicate[] = $key."=".$value;
@@ -80,4 +80,4 @@ public function InsOrUpdTemplate($data,$id){
         }
     }
     
-}
\ No newline at end of file
+}