diff --git a/api/src/Accounts/Ads.php b/api/src/Accounts/Ads.php
index b7a425f2e7..81d2306626 100644
--- a/api/src/Accounts/Ads.php
+++ b/api/src/Accounts/Ads.php
@@ -1062,7 +1062,7 @@ class Ads
 			}
 			if (!empty($param['account_id']))
 			{
-				if (($not_account_ids = array_search('!', $param['account_id'])) !== false)
+				if (($not_account_ids = array_search('!', (array)$param['account_id'])) !== false)
 				{
 					unset($param['account_id'][$not_account_ids]);
 				}