Warning: Attempt to read property "ID" on null in /var/www/vhosts/zuidbarge.nl/httpdocs/wp-content/plugins/events-manager/classes/em-taxonomy-frontend.php on line 51

Fatal error: Uncaught Error: Attempt to assign property "post_title" on null in /var/www/vhosts/zuidbarge.nl/httpdocs/wp-content/plugins/events-manager/classes/em-taxonomy-frontend.php:52
Stack trace:
#0 /var/www/vhosts/zuidbarge.nl/httpdocs/wp-content/plugins/events-manager/classes/em-categories-frontend.php(20): EM_Taxonomy_Frontend::template()
#1 /var/www/vhosts/zuidbarge.nl/httpdocs/wp-includes/class-wp-hook.php(326): EM_Categories_Frontend::template()
#2 /var/www/vhosts/zuidbarge.nl/httpdocs/wp-includes/plugin.php(205): WP_Hook->apply_filters()
#3 /var/www/vhosts/zuidbarge.nl/httpdocs/wp-includes/template.php(103): apply_filters()
#4 /var/www/vhosts/zuidbarge.nl/httpdocs/wp-includes/template.php(364): get_query_template()
#5 /var/www/vhosts/zuidbarge.nl/httpdocs/wp-includes/template-loader.php(81): get_taxonomy_template()
#6 /var/www/vhosts/zuidbarge.nl/httpdocs/wp-blog-header.php(19): require_once('/var/www/vhosts...')
#7 /var/www/vhosts/zuidbarge.nl/httpdocs/index.php(17): require('/var/www/vhosts...')
#8 {main}
  thrown in /var/www/vhosts/zuidbarge.nl/httpdocs/wp-content/plugins/events-manager/classes/em-taxonomy-frontend.php on line 52