diff --git a/langext/url.go b/langext/url.go
index bc5982c..2b44c43 100644
--- a/langext/url.go
+++ b/langext/url.go
@@ -6,7 +6,9 @@ import (
 )
 
 func BuildUrl(url, path string, params *map[string]string) string {
-	if path[:1] == "/" && url[len(url)-1:] == "/" {
+	if len(url) == 0 || len(path) == 0 {
+		url += path
+	} else if path[:1] == "/" && url[len(url)-1:] == "/" {
 		url += path[1:]
 	} else if path[:1] != "/" && url[len(url)-1:] != "/" {
 		url += "/" + path