control: severity -1 normal Hi!
Thanks for the report. I have been able to reproduce and I agree that this is a bug, although definitely not an "important" bug.
I understand that you are trying to script your screensaver interactions, but the screensaver already ships with builtin functionality for triggering after idle time, etc, so a misbehavior in the cinnamon-screensaver-command does not justify severity important.
Regarding the actual bug, I guess the code needs to be modified to catch the exception and either retry or exit with error, but not hang as it does here.
-- Regards, Marga