Fatal error: Uncaught TypeError: property_exists(): Argument #1 ($object_or_class) must be of type object|string, bool given in /usr/home/mw2p79qdlg/www/htdocs/reconect/wp/wp-content/themes/rcnt/functions/f-custom.php:81
Stack trace:
#0 /usr/home/mw2p79qdlg/www/htdocs/reconect/wp/wp-content/themes/rcnt/functions/f-custom.php(81): property_exists(false, 'slug')
#1 /usr/home/mw2p79qdlg/www/htdocs/reconect/wp/wp-includes/class-wp-hook.php(303): change_posts_per_page(Object(WP_Query))
#2 /usr/home/mw2p79qdlg/www/htdocs/reconect/wp/wp-includes/class-wp-hook.php(327): WP_Hook->apply_filters(Object(WP_Query), Array)
#3 /usr/home/mw2p79qdlg/www/htdocs/reconect/wp/wp-includes/plugin.php(518): WP_Hook->do_action(Array)
#4 /usr/home/mw2p79qdlg/www/htdocs/reconect/wp/wp-includes/class-wp-query.php(1784): do_action_ref_array('pre_get_posts', Array)
#5 /usr/home/mw2p79qdlg/www/htdocs/reconect/wp/wp-includes/class-wp-query.php(3465): WP_Query->get_posts()
#6 /usr/home/mw2p79qdlg/www/htdocs/reconect/wp/wp-includes/class-wp.php(629): WP_Query->query(Array)
#7 /usr/home/mw2p79qdlg/www/htdocs/reconect/wp/wp-includes/class-wp.php(752): WP->query_posts()
#8 /usr/home/mw2p79qdlg/www/htdocs/reconect/wp/wp-includes/functions.php(1291): WP->main('')
#9 /usr/home/mw2p79qdlg/www/htdocs/reconect/wp/wp-blog-header.php(16): wp()
#10 /usr/home/mw2p79qdlg/www/htdocs/index.php(17): require('/usr/home/mw2p7...')
#11 {main}
thrown in /usr/home/mw2p79qdlg/www/htdocs/reconect/wp/wp-content/themes/rcnt/functions/f-custom.php on line 81