[NSFW] Fatal error: Uncaught TypeError:

Fatal error: Uncaught TypeError: ReduxTemplates\Templates::add_body_class(): Return value must be of type string, null returned in /home/dnu43rjfm5t3/public_html/wp-content/plugins/redux-framework/redux-templates/classes/class-templates.php:88 Stack trace: #0 /home/dnu43rjfm5t3/public_html/wp-includes/class-wp-hook.php(303): ReduxTemplates\Templates->add_body_class() #1 /home/dnu43rjfm5t3/public_html/wp-includes/plugin.php(189): WP_Hook->apply_filters() #2 /home/dnu43rjfm5t3/public_html/wp-admin/admin-header.php(226): apply_filters() #3 /home/dnu43rjfm5t3/public_html/wp-admin/plugins.php(603): require_once(‘/home/dnu43rjfm…’) #4 {main} thrown in /home/dnu43rjfm5t3/public_html/wp-content/plugins/redux-framework/redux-templates/classes/class-templates.php on line 88