From d00e5a03c8e768f6db1f7342851fde5c64bff8dc Mon Sep 17 00:00:00 2001
From: Matthias Pfefferle <pfefferle@users.noreply.github.com>
Date: Tue, 21 Nov 2023 15:00:39 +0100
Subject: [PATCH] check if $resource is set

---
 includes/class-webfinger.php | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/includes/class-webfinger.php b/includes/class-webfinger.php
index b6b0a64..75f7ff6 100644
--- a/includes/class-webfinger.php
+++ b/includes/class-webfinger.php
@@ -41,9 +41,14 @@ class Webfinger {
 	 * @return string|WP_Error The URL or WP_Error
 	 */
 	public static function resolve( $resource ) {
+		if ( ! $resource ) {
+			return null;
+		}
+
 		if ( ! preg_match( '/^@?' . ACTIVITYPUB_USERNAME_REGEXP . '$/i', $resource, $m ) ) {
 			return null;
 		}
+
 		$transient_key = 'activitypub_resolve_' . ltrim( $resource, '@' );
 
 		$link = \get_transient( $transient_key );