diff --git a/controllers/admin/AdminTrackingController.php b/controllers/admin/AdminTrackingController.php
index 241ac56bf..51959193e 100644
--- a/controllers/admin/AdminTrackingController.php
+++ b/controllers/admin/AdminTrackingController.php
@@ -207,6 +207,7 @@ class AdminTrackingControllerCore extends AdminController
 		$this->_defaultOrderBy = '';
 		$this->_defaultOrderWay = '';
 		$this->_filter = '';
+		$this->_group = '';
 		$this->list_no_filter = true;
 		$this->list_title = $this->l('Product disabled');
 	}