tt-rss version (including git commit id):

https://git.tt-rss.org/fox/tt-rss/commit/dff479af649005c819e16ed8e75278ab50c955b3

Platform (i.e. Linux distro, PHP, PostgreSQL, etc) versions:

PHP Version 7.4.19

System Linux localhost 3.10.0-1160.25.1.el7.x86_64 #1 SMP Wed Apr 28 21:49:45 UTC 2021 x86_64
Build Date May 4 2021 11:06:37
Build System Red Hat Enterprise Linux Server release 7.9 (Maipo)
Build Provider Remi’s RPM repository https://rpms.remirepo.net/
Server API Apache 2.0 Handler

error/warning log:

Uncaught TypeError: Argument 1 passed to with_trailing_slash() must be of the type string, null given, called in /var/www/html/feed/classes/urlhelper.php on line 54 and defined in /var/www/html/feed/include/functions.php:239

Stack trace:
#0 /var/www/html/feed/classes/urlhelper.php(54): with_trailing_slash(NULL)
#1 /var/www/html/feed/include/functions.php(197): UrlHelper::rewrite_relative(‘https://www.mac…’, ‘mailto:mac911@m…’)
#2 /var/www/html/feed/classes/sanitizer.php(77): rewrite_relative_url(‘https://www.mac…’, ‘mailto:mac911@m…’)
#3 /var/www/html/feed/classes/feeds.php(250): Sanitizer::sanitize('_format_headlines_list(5, ‘’, ‘adaptive’, 30, true, 0, ‘updated’, true, 0, true, ‘date_reverse’)
#5 /var/www/html/feed/backend.php(133): Feeds->view()
#6 {main}
thrown

Remote IP: 103.119.141.177
Request URI: /backend.php
User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:88.0) Gecko/20100101 Firefox/88.0

https://git.tt-rss.org/fox/tt-rss/commit/326850845da67fcdd3bf736a470bad6233234ec8

oops, etc