diff --git a/plugin.php b/plugin.php
index 0cc1110..902e17e 100644
--- a/plugin.php
+++ b/plugin.php
@@ -53,8 +53,7 @@ function ldapauth_environment_check() {
 
 # Reroute login to yourls filter 
 # (see https://github.com/YOURLS/YOURLS/wiki/Advanced-Hook-Syntax)
-//yourls_add_filter( 'is_valid_user', 'ldapauth_is_valid_user' );
-yourls_add_filter( 'shunt_is_valid_user', 'ldapauth_is_valid_user' );
+yourls_add_filter( 'is_valid_user', 'ldapauth_is_valid_user' );
 
 function ldapauth_shuffle_assoc($list) {
 	if (!is_array($list)) return $list;
@@ -104,8 +103,7 @@ function ldapauth_is_valid_user( $value ) {
 				$yourls_user_passwords[$username]='phpass:ThereIsNoPasswordButHey,WhoCares?';
 			}
 			yourls_set_user( $_SESSION['LDAPAUTH_AUTH_USER'] );
-            //return true; //modified 12.04.2023 by vmario. function must return null to match shunt_is_valid_user in functions-auth.php
-            return null;
+            return true;
 
 		} else {
 			ldapauth_debug($username . ' is not admin user.');