From ab983e74b5da1c332e9f99aa93b0679171d4532f Mon Sep 17 00:00:00 2001
From: Ian Dunn <ian@iandunn.name>
Date: Thu, 7 Dec 2023 07:31:57 -0800
Subject: [PATCH] Check for null string before escaping

This avoids a `ltrim(): Passing null to parameter #1 ($string) of type string is deprecated` notice on PHP 8.1.
---
 wp-cache-phase2.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/wp-cache-phase2.php b/wp-cache-phase2.php
index 9c54a1e2..70dd8a55 100644
--- a/wp-cache-phase2.php
+++ b/wp-cache-phase2.php
@@ -391,7 +391,7 @@ function wp_cache_postload() {
 	global $wp_cache_request_uri;
 
 	// have to sanitize here because formatting.php is loaded after wp_cache_request_uri is set
-	$wp_cache_request_uri = esc_url_raw( wp_unslash( $wp_cache_request_uri ) );
+	$wp_cache_request_uri = esc_url_raw( wp_unslash( $wp_cache_request_uri ? $wp_cache_request_uri : '' ) );
 
 	if ( ! $cache_enabled ) {
 		return true;