diff --git a/Layout/default/Preorder/Index.php b/Layout/default/Preorder/Index.php
index abc1dc15a..f4bb8046d 100644
--- a/Layout/default/Preorder/Index.php
+++ b/Layout/default/Preorder/Index.php
@@ -171,7 +171,7 @@
                           <?php
                           // if partner_id is string unset it from filter
                           if(isset($filter) && array_key_exists("preordercampaign_id", $filter) && is_string($filter["preordercampaign_id"])) {
-                              unset($filter["preordercampaign_id"]);
+                              $filter["preordercampaign_id"] = explode(",", $filter["preordercampaign_id"]);
                           }
                           ?>
                           <?php foreach($my_campaigns as $c): ?>