Fatal error: Uncaught Error: Using $this when not in object context in /system/class/class.config.php:31
Stack trace:
#0 /system/class/class.seo.php(13): config::get('query_string')
#1 /index.php(201): seo->title(NULL)
#2 {main}
thrown in /system/class/class.config.php on line 31