From cba3d83a930e9371cdfb5ab77cd585b6ec5d0216 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Micha=C5=82=20Bundyra?= <contact@webimpress.com>
Date: Wed, 1 Dec 2021 12:47:49 +0000
Subject: [PATCH] fix: PHP 8.1 deprecation issue (#1205)

laravel.WARNING: trim(): Passing null to parameter #1 ($string) of type string is deprecated in /srv/api/vendor/laravel/lumen-framework/src/Routing/Router.php on line 151
---
 src/Routing/Router.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Routing/Router.php b/src/Routing/Router.php
index 799d83853cbf..d92082ef04fc 100644
--- a/src/Routing/Router.php
+++ b/src/Routing/Router.php
@@ -148,7 +148,7 @@ protected static function formatGroupPrefix($new, $old)
         $oldPrefix = $old['prefix'] ?? null;
 
         if (isset($new['prefix'])) {
-            return trim($oldPrefix, '/').'/'.trim($new['prefix'], '/');
+            return trim($oldPrefix ?? '', '/').'/'.trim($new['prefix'], '/');
         }
 
         return $oldPrefix;