From f9d63a3581428fd8a3858e161d072f0b9debc26f Mon Sep 17 00:00:00 2001
From: Alejandro Celaya <alejandrocelaya@gmail.com>
Date: Tue, 7 Dec 2021 19:35:06 +0100
Subject: [PATCH] Fixed PHP 8.1 deprecation warning (#475)

---
 src/CrawlerDetect.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/CrawlerDetect.php b/src/CrawlerDetect.php
index 777bdc37..89287cba 100644
--- a/src/CrawlerDetect.php
+++ b/src/CrawlerDetect.php
@@ -165,7 +165,7 @@ public function isCrawler($userAgent = null)
         $agent = trim(preg_replace(
             "/{$this->compiledExclusions}/i",
             '',
-            $userAgent ?: $this->userAgent
+            $userAgent ?: $this->userAgent ?: ''
         ));
 
         if ($agent === '') {