diff --git a/api/src/Accounts/Ads.php b/api/src/Accounts/Ads.php
index 18493eb6c3..f231d675e1 100644
--- a/api/src/Accounts/Ads.php
+++ b/api/src/Accounts/Ads.php
@@ -970,7 +970,7 @@ class Ads
 			}
 			if (!empty($param['account_id']))
 			{
-				$account_ids_filter = '(|(objectsid='.implode(')(objectsid=', array_map([$this, 'get_sid'], $param['account_id'])).')';
+				$account_ids_filter = '(|(objectsid='.implode(')(objectsid=', array_map([$this, 'get_sid'], (array)$param['account_id'])).')';
 				$filter = $filter ? "(&$filter$account_ids_filter)" : $account_ids_filter;
 			}
 			if (!empty($param['modified']))