Hi @rzrate,
I logged into your osTicket Awesome installation and I see that this is happening consistently. I can understand that it is frustrating for you and your users.
I did some research, however, and it seems that this is a problem with osTicket itself — it is not related to osTicket Awesome.
Please visit this link for more information and a possible fix:
https://forum.osticket.com/d/93724-task-opening-seems-to-giving-error-from-ticket-page