Undefined offset: 0 in WordPress after latest version upgrade

My WordPress powered website always worked great, however after the latest upgrade to 5.6.2 and 5.7 I have a major issue that actually breaks an important part of the website, I have seen to go through the logs and found the following error: [14-Mar-2021 00:29:32 UTC] PHP Notice: Undefined offset: 0 in /var/www/html/wp-content/plugins/tours/includes/class-tours-tour-post-type.php on line … Read more