diff --git a/application/Api/v1/PreorderApicontroller.php b/application/Api/v1/PreorderApicontroller.php
index 0bec2eb2d..72eb12a7f 100644
--- a/application/Api/v1/PreorderApicontroller.php
+++ b/application/Api/v1/PreorderApicontroller.php
@@ -105,7 +105,12 @@ class PreorderApicontroller extends mfBaseApicontroller {
     
     $preorder_search = [];
     $preorder_search['partner_id'] = $this->me->address_id;
-    $preorder_search['add-where'] = "AND tt_preorder.`edit` > $update_ts";
+    if($update_ts) {
+      $preorder_search['add-where'] = "AND tt_preorder.`edit` > $update_ts";
+    } else {
+      // if no timestamp, return only open orders (500 == finished)
+      $preorder_search['<status_code'] = 500;
+    }
     
     $return = [];