Can't open shared room calendar in grommunio-web

[deajan]

So when I try to add a shared room calendar via the "Add Shared Calendar +" button, I get the following error:

I've tried to create s shared room without any spaces in it's name for the experiment to outrule any escaping issues.
Checking the shared room in meeting planner works.

Running:
grommunio Web: 3.14.28.g3861ba1a1-lp156.283.1
Gromox: 2.48.145.gc40fe13