Raspicam not working anymore after upgrade to 1.9.0

Camera model
Raspicam V2

What is the problem?
Stream is not working: I get

The webcam server is currently not running

when I go to /webcam/?action=stream

What did you already try to solve it?
Tried several things, none helped to resolve the issue

Logs (/var/log/webcamd.log, syslog, dmesg, ... no logs, no support)

Starting up webcamDaemon...

--- Configuration: ----------------------------
cfg_file: /home/pi/klipper_config/webcam.txt
camera: raspi
usb options: -r 1920x1080 -f 20
raspi options: -x 1920 -y 1080 -fps 10
http options: -w ./www-mjpgstreamer -n

Explicitly USB device:

Found video devices:
Scan again in two minutes
/usr/local/bin/webcamd: line 103: kill: (682) - No such process


Additional information about your setup (OctoPrint version, OctoPi version, ...)