diff --git a/src/web/helpers/lang.php b/src/web/helpers/lang.php
index ba7616e..72167fc 100644
--- a/src/web/helpers/lang.php
+++ b/src/web/helpers/lang.php
@@ -29,10 +29,10 @@ function lang(
  */
 function ilang(
 	string $key,
-	string $class = NULL,
-	string $id = NULL,
-	string $href = NULL,
-	string $click = NULL,
+	?string $class = NULL,
+	?string $id = NULL,
+	?string $href = NULL,
+	?string $click = NULL,
 	array  $attrs = array(),
 	?array $sub = NULL,
 	bool   $button = FALSE,