Warning: Trying to access array offset on value of type null in /customers/9/9/8/duvedsif.se/httpd.www/wp-content/themes/duvedsif/single-event.php on line 48

Fatal error: Uncaught TypeError: array_filter(): Argument #1 ($array) must be of type array, null given in /customers/9/9/8/duvedsif.se/httpd.www/wp-content/themes/duvedsif/single-event.php:53
Stack trace:
#0 /customers/9/9/8/duvedsif.se/httpd.www/wp-content/themes/duvedsif/single-event.php(53): array_filter(NULL, Object(Closure))
#1 /customers/9/9/8/duvedsif.se/httpd.www/wp-includes/template-loader.php(106): include('/customers/9/9/...')
#2 /customers/9/9/8/duvedsif.se/httpd.www/wp-blog-header.php(19): require_once('/customers/9/9/...')
#3 /customers/9/9/8/duvedsif.se/httpd.www/index.php(17): require('/customers/9/9/...')
#4 {main}
  thrown in /customers/9/9/8/duvedsif.se/httpd.www/wp-content/themes/duvedsif/single-event.php on line 53