Vendor activation fatal error

-- HikaShop version -- : 2.4.0
-- HikaMarket version -- : 1.6.2
-- Joomla version -- : 3.4.1
-- PHP version -- : 5.5.12
-- Browser(s) name and version -- : Chrome 43
-- Error-message(debug-mod must be tuned on) -- : Fatal error: Call to undefined method stdClass::get() in C:\wamp\www\components\com_hikamarket\controllers\vendor.php on line 234

Hello,

When i click on the activation link received after registering as vendor ( www.myebsite.com/index.php?option=com_hi...4&Itemid=656&lang=en ) , i get this message (using debug set to maximum)

Fatal error: Call to undefined method stdClass::get() in C:\wamp\www\components\com_hikamarket\controllers\vendor.php on line 234

Line 234 is : $user_id = $userClass->getID($user->get('id'));

If the debug is set to default, the user will see a 500 error message. The configuration is set to automatically activate the vendor account.

After refresh, the user and vendor accounts are activated and i'm logged in, but i need to get rid of the 500 error message.

Thank you