avnav cannot connect to signalk

[atchik6056]

Hi
getting error in avnav:

2024-11-15 23:37:46,927-2577592-2577638-pionono_SK-INFO-STATUS[main] NMEA, connected at http://localhost:3000/signalk/v1/api/
2024-11-15 23:38:01,721-2577592-2577638-pionono_SK-ERROR-error when fetching from signalk http://localhost:3000/signalk/v1/api/: Traceback (most recent call last):
File "/usr/lib/avnav/server/handler/signalkhandler.py", line 1189, in _runI
self.storeData(data,self.config.priority)
File "/usr/lib/avnav/server/handler/signalkhandler.py", line 1660, in storeData
self.iterateToValue(node,None,store)
File "/usr/lib/avnav/server/handler/signalkhandler.py", line 1640, in iterateToValue
self.iterateToValue(v,path,callback)
File "/usr/lib/avnav/server/handler/signalkhandler.py", line 1640, in iterateToValue
self.iterateToValue(v,path,callback)
File "/usr/lib/avnav/server/handler/signalkhandler.py", line 1640, in iterateToValue
self.iterateToValue(v,path,callback)
File "/usr/lib/avnav/server/handler/signalkhandler.py", line 1635, in iterateToValue
callback(prefix,node.get('value'),node.get('$source'),node.get('timestamp'))
File "/usr/lib/avnav/server/handler/signalkhandler.py", line 1656, in store
if self.checkOutdated(timestamp):
File "/usr/lib/avnav/server/handler/signalkhandler.py", line 1243, in checkOutdated
if timeStamp < oldest:
TypeError: '<' not supported between instances of 'NoneType' and 'float'

2024-11-15 23:38:01,721-2577592-2577638-pionono_SK-INFO-STATUS[main] ERROR, error when fetching from signalk http://localhost:3000/signalk/v1/api/

avnav server running ok:

root@lysmarine:/home/user/avnav/data# systemctl status avnav
● avnav.service - NMEA multiplexer and Browser based navigation
     Loaded: loaded (/lib/systemd/system/avnav.service; enabled; vendor preset: enabled)
    Drop-In: /usr/lib/systemd/system/avnav.service.d
             └─lys-avnav.conf
     Active: active (running) since Fri 2024-11-15 23:03:39 WET; 9s ago
    Process: 2575812 ExecStartPre=sh -c chown -R user:user /home/user/avnav/data || true (code=exited, status=0/SUCCESS)
   Main PID: 2575814 (python3)
      Tasks: 103 (limit: 9155)
        CPU: 10.014s
     CGroup: /system.slice/avnav.service
             ├─2575814 python3 /usr/lib/avnav/server/avnav_server.py -q -l INFO -c /home/user/avnav/data/charts -w /home/user/avnav/data -u viewer=/usr/lib>
             ├─2575903 /bin/sh /usr/bin/xvfb-run -n 1000 -s -screen 0 512x512x24 /usr/lib/avnav/plugins/ocharts/AvnavOchartsProvider -t 5 -d 1 -s 2 -l /hom>
             ├─2575918 Xvfb :1000 -screen 0 512x512x24 -nolisten tcp -auth /tmp/xvfb-run.cc5zLA/Xauthority
             ├─2575935 /usr/lib/avnav/plugins/ocharts/AvnavOchartsProvider -t 5 -d 1 -s 2 -l /home/user/avnav/data/ocharts/provider.log -p 2575814 -c 10000>
             ├─2575959 dbus-launch --autolaunch 12f998bee792d932e186517564bd6d3f --binary-syntax --close-stderr
             ├─2575963 /usr/bin/dbus-daemon --syslog-only --fork --print-pid 5 --print-address 7 --session
             ├─2575965 /usr/libexec/at-spi-bus-launcher
             ├─2575970 /usr/bin/dbus-daemon --config-file=/usr/share/defaults/at-spi2/accessibility.conf --nofork --print-address 3
             └─2576024 /usr/libexec/at-spi2-registryd --use-gnome-session

Nov 15 23:03:39 lysmarine systemd[1]: Starting NMEA multiplexer and Browser based navigation...
Nov 15 23:03:39 lysmarine systemd[1]: Started NMEA multiplexer and Browser based navigation.
Nov 15 23:03:39 lysmarine avnav[2575814]: chartdir=/home/user/avnav/data/charts, basedir=/home/user/avnav/data, config=/home/user/avnav/data/avnav_server.x>
Nov 15 23:03:40 lysmarine avnav[2575814]: 2024-11-15 23:03:40,713-2575814-2575814-MainThread-INFO-basedir=/usr/lib/avnav/server,datadir=/home/user/avnav/da>
Nov 15 23:03:40 lysmarine avnav[2575814]: 2024-11-15 23:03:40,713-2575814-2575814-MainThread-INFO-####start processing (version=20240616, logging to /home/>
Nov 15 23:03:43 lysmarine dbus-daemon[2575963]: [session uid=1000 pid=2575958] Activating service name='org.a11y.Bus' requested by ':1.0' (uid=1000 pid=257>
Nov 15 23:03:43 lysmarine dbus-daemon[2575963]: [session uid=1000 pid=2575958] Successfully activated service 'org.a11y.Bus'
Nov 15 23:03:45 lysmarine org.a11y.Bus[2575970]: dbus-daemon[2575970]: Activating service name='org.a11y.atspi.Registry' requested by ':1.0' (uid=1000 pid=>
Nov 15 23:03:45 lysmarine org.a11y.Bus[2575970]: dbus-daemon[2575970]: Successfully activated service 'org.a11y.atspi.Registry'
Nov 15 23:03:45 lysmarine org.a11y.Bus[2576024]: SpiRegistry daemon is running with well-known name - org.a11y.atspi.Registry 

apparently the code responsible for that at https://github.com/wellenvogel/avnav/blob/master/server/handler/signalkhandler.py (line 1243)

  def checkOutdated(self,timeStamp):
    expiryPeriod=self.navdata.getExpiryPeriod()
    oldest=time.monotonic()-expiryPeriod
    if timeStamp < oldest:
      return True
    return False

any idea?
thank you