diff --git a/htdocs/ticket/class/api_tickets.class.php b/htdocs/ticket/class/api_tickets.class.php
index 3151f75877b..629eab03d77 100644
--- a/htdocs/ticket/class/api_tickets.class.php
+++ b/htdocs/ticket/class/api_tickets.class.php
@@ -242,6 +242,7 @@ class Tickets extends DolibarrApi
 			$socid = DolibarrApiAccess::$user->socid;
 		}
 
+		$search_sale = null;
 		// If the internal user must only see his customers, force searching by him
 		if (!DolibarrApiAccess::$user->rights->societe->client->voir && !$socid) {
 			$search_sale = DolibarrApiAccess::$user->id;