diff --git a/app/Repositories/Shop/Invoices.php b/app/Repositories/Shop/Invoices.php
index 176f5293..71f73078 100644
--- a/app/Repositories/Shop/Invoices.php
+++ b/app/Repositories/Shop/Invoices.php
@@ -78,7 +78,7 @@ class Invoices
     public static function getNewRef()
     {
         $ref = date('ymd').'00000';
-        $lastRef = Invoice::where($ref, '>', $ref)->orderBy('id', 'desc')->first();
+        $lastRef = Invoice::where('ref', '>', $ref)->orderBy('id', 'desc')->first();
 
         return $lastRef ? $lastRef->ref + 1 : $ref + 1;
     }
diff --git a/app/Repositories/Shop/Orders.php b/app/Repositories/Shop/Orders.php
index 359a0ed2..5d45d36e 100644
--- a/app/Repositories/Shop/Orders.php
+++ b/app/Repositories/Shop/Orders.php
@@ -112,7 +112,7 @@ class Orders
     public static function getNewRef()
     {
         $ref = date('ymd').'00000';
-        $lastRef = Order::where($ref, '>', $ref)->orderBy('id', 'desc')->first();
+        $lastRef = Order::where('ref', '>', $ref)->orderBy('id', 'desc')->first();
 
         return $lastRef ? $lastRef->ref + 1 : $ref + 1;
     }