php Notice: Undefined property: stdClass::$subject in include()

I am getting lots of php notices like this.

Notice: Undefined property: stdClass::$subject in include() (line 5 of /home/***/public_html/sites/all/themes/adaptivetheme/adaptivetheme/adaptivetheme/templates/block.tpl.php)

Can you please check it? Also, please let me know if and how can I help. Thanks!