Fatal error: Call to a member function add() on a non-object in /www/subeta.net/include/mvc/models/quest.php on line 256

When I have the items required for the quest, I press 'finish quest' and the above error comes up. When I go back to retry to finish the quest, the notice ..> Oh No! You don't have all the items required for this quest!

The items are consumed but the quest cannot be completed. I tried rebuying the same items but the same happens.

Edit - just heard from another player that ALL quests are messed up atm!

Chrome, windows 8.1

Ty for your attention.

Edit - I just heard from another player who said that ALL quests are messed up!