NVDARemoteServer crashes after seeming to be frozen.

[blindndangerous]

Was trying to figure out why I kept seeing the server thread seems frozen message, and got this in my log when running nvdaremoteserver debug.
Mon May 23 10:30:29 2022
Traceback (most recent call last):
File "/usr/share/NVDARemoteServer/server.py", line 333, in run
r, w, e = select.select(self.client_sockets + [close_listener], self.client_sockets, self.client_sockets, 60)
ValueError: file descriptor cannot be a negative integer (-1)

[KevanGP]

Do you have your key and certificate set?
When I installed the server without doing so, it crashed every couple minutes.