Fatal error: Uncaught TypeError: join(): Argument #2 ($array) must be of type ?array, string given in /var/www/vhosts/tummels.ch/tummels/wp-content/plugins/thb-portfolio/inc/frontend.php:258 Stack trace: #0 /var/www/vhosts/tummels.ch/tummels/wp-content/plugins/thb-portfolio/inc/frontend.php(258): join(Array, ', ') #1 /var/www/vhosts/tummels.ch/tummels/wp-content/themes/one/templates/thb-portfolio/portfolio-item.php(3): thb_get_portfolio_item_subtitle() #2 /var/www/vhosts/tummels.ch/tummels/wp-content/themes/one/framework/helpers/helper.frontend.php(326): include('/var/www/vhosts...') #3 /var/www/vhosts/tummels.ch/tummels/wp-content/plugins/thb-portfolio/inc/frontend.php(34): thb_get_subtemplate('thb-portfolio/', '/var/www/vhosts...', 'portfolio-item....', Array) #4 /var/www/vhosts/tummels.ch/tummels/wp-content/plugins/thb-portfolio/inc/frontend.php(222): thb_portfolio_get_template_part('portfolio-item', Array) #5 /var/www/vhosts/tummels.ch/tummels/wp-content/themes/one/templates/thb-portfolio/portfolio.php(39): thb_portfolio_item(Array) #6 /var/www/vhosts/tummels.ch/tummels/wp-content/themes/one/framework/helpers/helper.frontend.php(326): include('/var/www/vhosts...') #7 /var/www/vhosts/tummels.ch/tummels/wp-content/plugins/thb-portfolio/inc/frontend.php(34): thb_get_subtemplate('thb-portfolio/', '/var/www/vhosts...', 'portfolio.php', Array) #8 /var/www/vhosts/tummels.ch/tummels/wp-content/plugins/thb-portfolio/inc/frontend.php(208): thb_portfolio_get_template_part('portfolio', Array) #9 /var/www/vhosts/tummels.ch/tummels/wp-content/themes/one/template-portfolio.php(58): thb_portfolio_loop() #10 /var/www/vhosts/tummels.ch/tummels/wp-includes/template-loader.php(106): include('/var/www/vhosts...') #11 /var/www/vhosts/tummels.ch/tummels/wp-blog-header.php(19): require_once('/var/www/vhosts...') #12 /var/www/vhosts/tummels.ch/tummels/index.php(17): require('/var/www/vhosts...') #13 {main} thrown in /var/www/vhosts/tummels.ch/tummels/wp-content/plugins/thb-portfolio/inc/frontend.php on line 258