Error while running shinyapp at the same time by different users on free version

I made a Shinyapp and deployed in But even when one Shinyapp session on one of the user's browser is closed, all other session on other users browsers stops.

Could anyone let me know if this can be solved with paid version or is this due to some bug in my program?

I have attached the error message (disconnected from the server) that displays on my screen once another user closes his/her browser tab. Similarly the log from the dashboard is attached here. The logs are from my recent session when I completed the task from incognito mode and closed it while another session was still running on my browser (non-incognito).

*Edit: I am not allowed to add another image about the error message which I have mentioned above. So, the error message was "Disconnected from the server." and the screen had greyed out.