I've been using this plugin for a long time, and I haven't installed or activated anything lately, or even deactivated.
All I've been doing was my daily backup.
Today my site front page got blank, with only the light green background,
Como Dinheiro Website - Click here to access. I disabled the sef in global configuration and everything started working again.
When I opened the error log file, look what I got:
PHP Fatal error: Call to undefined method stdClass::set() in /home/lucrebem/public_html/components/com_sef/joomsef.php on line 387