From 643c47dcb7644af10d6687e4a119a4c7c6fa7454 Mon Sep 17 00:00:00 2001
From: Jeremy Herve <jeremy@jeremy.hu>
Date: Mon, 10 Apr 2023 13:10:46 +0200
Subject: [PATCH] Webfinger info: avoid PHP warning when user isn't defined

This should avoid warnings like this one:

```
PHP Warning:  Attempt to read property "user_login" on bool in /var/www/html/wp-content/plugins/activitypub/includes/class-webfinger.php on line 27
```
---
 includes/class-webfinger.php | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/includes/class-webfinger.php b/includes/class-webfinger.php
index ab33411..c7d2cba 100644
--- a/includes/class-webfinger.php
+++ b/includes/class-webfinger.php
@@ -23,6 +23,9 @@ class Webfinger {
 		}
 
 		$user = \get_user_by( 'id', $user_id );
+		if ( ! $user ) {
+			return '';
+		}
 
 		return $user->user_login . '@' . \wp_parse_url( \home_url(), \PHP_URL_HOST );
 	}