Fatal error: Unsupported operand types

[kmh496 <kmh496@xxxxxxxxxx>]

can somebody explain why

            $this->param = $this->SYSTEM->db->answer + $this->param;

is causing the error 


Fatal error: Unsupported operand types
in /var/www/current/mjguest/modules/settings.php on line 52



context is 


        function settings(&$SYSTEM)
        {
            $this->SYSTEM = &$SYSTEM;
            $this->SYSTEM->db->ask(1, 'settings_load');
            $this->SYSTEM->db->get_row();

            $this->param = $this->SYSTEM->db->answer + $this->param;
        }




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