// Add js type check

git-svn-id: http://dev.prestashop.com/svn/v1/branches/1.5.x@12367 b9a71923-0436-4b27-9f14-aed3839534dd

js/admin-products.js

@@ -260,7 +260,8 @@ function displayTabProductById(id, selected, index, stack)
 		beforeSend : function(data)
 		{
 			// don't display the loading notification bar
-			clearTimeout(ajax_running_timeout);
+			if (typeof(ajax_running_timeout) !== 'undefined')
+				clearTimeout(ajax_running_timeout);
 		}
 	});
 }