Missing php_self variable

Most of the controller have the php_self variable but not the ProductController.

controllers/front/ProductController.php

@@ -26,6 +26,7 @@
 
 class ProductControllerCore extends FrontController
 {
+	public $php_self = 'product';
 	/**
 	 * @var Product
 	 */
@@ -615,4 +616,4 @@ class ProductControllerCore extends FrontController
 		}
 		return $specific_prices;
 	}
-}
+}