From f386f4e0013daadaa213681a0a41af69aa81d9de Mon Sep 17 00:00:00 2001
From: Jamie Burchell <jamieburchell@users.noreply.github.com>
Date: Wed, 23 Feb 2022 14:52:03 +0000
Subject: [PATCH] Don't attempt to lowercase a NULL

Fixes PHP 8.1 deprecation notice when trying to `strtolower` `NULL`
---
 src/RestController.php | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/RestController.php b/src/RestController.php
index 9ab38913..0e0aa4bc 100644
--- a/src/RestController.php
+++ b/src/RestController.php
@@ -834,7 +834,9 @@ protected function _detect_method()
                 $method = $this->input->server('HTTP_X_HTTP_METHOD_OVERRIDE');
             }
 
-            $method = strtolower($method);
+            if ($method !== null) {
+                $method = strtolower($method);
+            }
         }
 
         if (empty($method)) {