rsyslog: capture errors from "omprog" script

I am using custom python script to process logs, and ban offending IPs. Here is the line from my /etc/rsyslog.conf: local0.* action(type="omprog" name="asterisk" binary="/usr/local/sbin/asterisk.py") When my script generates some error, I don't see it anywhere in the logs (but I do see python errors when I run my script manually with given input) Do I have to redirect the errors somewhere explicitly ? I am using rsyslog 8.1901 on Debian 10