Fatal error: Uncaught Exception: DateTime::__construct(): Failed to parse time string (--) at position 0 (-): Unexpected character in /customers/b/f/b/hondenschool.be/httpd.www/wp-content/plugins/the-holiday-calendar/helpers/helper.class.php:156 Stack trace: #0 /customers/b/f/b/hondenschool.be/httpd.www/wp-content/plugins/the-holiday-calendar/helpers/helper.class.php(156): DateTime->__construct('--') #1 /customers/b/f/b/hondenschool.be/httpd.www/wp-content/plugins/the-holiday-calendar/helpers/string-helper.class.php(19): thc_helper::formatDate('') #2 /customers/b/f/b/hondenschool.be/httpd.www/wp-content/plugins/the-holiday-calendar/the-holiday-calendar.php(230): thc_string_helper::convert_dates_to_single_line('', '', '', '') #3 /customers/b/f/b/hondenschool.be/httpd.www/wp-includes/class-wp-hook.php(307): the_holiday_calendar::override_title('Diensthonden &#...', 1127) #4 /customers/b/f/b/hondenschool.be/httpd.www/wp-includes/plugin.php(191): WP_Hook->apply_filters('Diensthonden &#...', Array) #5 /customers/b/f/b/hondenschool.be/httpd.www/wp-includes/post-template.php(171): apply_filters('the_title', 'Diensthonden - ...', 1127) #6 /customers/b/f/b/hondenschool.be/httpd.www/wp-includes/post-template.php(43): get_the_title() #7 /customers/b/f/b/hondenschool.be/httpd.www/wp-content/themes/petcare/single.php(20): the_title() #8 /customers/b/f/b/hondenschool.be/httpd.www/wp-includes/template-loader.php(106): include('/customers/b/f/...') #9 /customers/b/f/b/hondenschool.be/httpd.www/wp-blog-header.php(19): require_once('/customers/b/f/...') #10 /customers/b/f/b/hondenschool.be/httpd.www/index.php(17): require('/customers/b/f/...') #11 {main} thrown in /customers/b/f/b/hondenschool.be/httpd.www/wp-content/plugins/the-holiday-calendar/helpers/helper.class.php on line 156