Fatal error: Uncaught Exception: DateTime::__construct(): Failed to parse time string (--) at position 0 (-): Unexpected character in /var/www/web29967222/html/wordpress/wp-content/plugins/the-holiday-calendar/helpers/helper.class.php:156 Stack trace: #0 /var/www/web29967222/html/wordpress/wp-content/plugins/the-holiday-calendar/helpers/helper.class.php(156): DateTime->__construct('--') #1 /var/www/web29967222/html/wordpress/wp-content/plugins/the-holiday-calendar/helpers/string-helper.class.php(19): thc_helper::formatDate('') #2 /var/www/web29967222/html/wordpress/wp-content/plugins/the-holiday-calendar/the-holiday-calendar.php(217): thc_string_helper::convert_dates_to_single_line('', '', '', '') #3 /var/www/web29967222/html/wordpress/wp-includes/class-wp-hook.php(286): the_holiday_calendar::override_title('ab 23.4.2019 Hu...', 523) #4 /var/www/web29967222/html/wordpress/wp-includes/plugin.php(208): WP_Hook->apply_filters('ab 23.4.2019 Hu...', Array) #5 /var/www/web29967222/html/wordpress/wp-includes/post-template.php(16 in /var/www/web29967222/html/wordpress/wp-content/plugins/the-holiday-calendar/helpers/helper.class.php on line 156