diff --git a/etc/inc/xmlrpc.inc b/etc/inc/xmlrpc.inc
index d190a059fd..e722e9dd02 100644
--- a/etc/inc/xmlrpc.inc
+++ b/etc/inc/xmlrpc.inc
@@ -129,7 +129,7 @@ function xmlrpc_auth(&$params) {
 		array_shift($params);
 		unset($params['xmlrpcauth']);
 		return true;
-	} else if (authenticate_user("admin", $params['xmlrpcauth'])) {
+	} else if (!empty($params['xmlrpcauth']) && authenticate_user("admin", $params['xmlrpcauth'])) {
 		array_shift($params);
 		unset($params['xmlrpcauth']);
 		return true;