500 Internal Server Error

Trying to get property 'id' of non-object in /usr/local/www/www.sandown-group.co.uk/modules/brochures/brochure.php on 8

#0  Util::throw500() called at [/usr/local/www/www.sandown-group.co.uk/classes/core/system.class.php:63]
#1  System::errorHandler() called at [/usr/local/www/www.sandown-group.co.uk/modules/brochures/brochure.php:8]
#2  include(/usr/local/www/www.sandown-group.co.uk/modules/brochures/brochure.php) called at [/usr/local/www/www.sandown-group.co.uk/www/index.php:36]