Bug Description

When I apply a custom user class, i.e. a non fixed class, to a forum, it generates a Fatal error: Uncaught TypeError

Fatal error: Uncaught TypeError: Illegal offset type in isset or empty in /usr/www/public_html/e107_handlers/userclass_class.php:108 Stack trace: #0 /usr/www/public_html/e107_plugins/forum/shortcodes/batch/viewforum_shortcodes.php(245): user_class->getFixedClassDescription() #1 /usr/www/public_html/e107_handlers/shortcode_handler.php(1154): plugin_forum_viewforum_shortcodes->sc_viewable_by() #2 [internal function]: e_parse_shortcode->doCode() #3 /usr/www/public_html/e107_handlers/shortcode_handler.php(1020): preg_replace_callback() #4 /usr/www/public_html/e107_handlers/e_parse_class.php(848): e_parse_shortcode->parseCodes() #5 /usr/www/public_html/e107_plugins/forum/forum_viewforum.php(445): e_parse->parseTemplate() #6 /usr/www/public_html/e107_plugins/forum/forum_viewforum.php(56): forum_viewforum_front->init() #7 /usr/www/public_html/e107_plugins/forum/forum_viewforum.php(565): forum_viewforum_front->__construct() #8 /usr/www/public_html/index.php(69): include_once('...') #9 {main} thrown in /usr/www/public_html/e107_handlers/userclass_class.php on line 108

How to Reproduce

Steps to reproduce the behavior:

1. Create a standard user class
2. Add this class to a user
3. Apply this class to the 'Visibility' of a forum and then visit this forum as above mentioned user
4. You should get a similar stack trace as shown above.

Expected Behavior

Well, I kinda expect to apply custom user classes to forums to limit their visibility. It appears that in ./e107_plugins/forum/shortcodes/batch/viewforum_shortcodes.php(), it is passing an array which clearly won't work.

Server Information

PHP Operating System

Linux hosted5 5.15.82 #1 SMP Sat Dec 10 23:29:08 PST 2022 x86_64

PHP Version

PHP Version 8.1.12

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